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The Rashidun Caliphate had its inception with the advent of Islam. It was situated amidst two of the most formidable empires of the known world: The Byzantine Empire and The Sassanid Empire.

Map of Byzantium and Sassanid Empires

But within 30 years, the Caliphate overwhelmed both the empires. The Byzantine Empire lost more than 60% of its territory to it. The Sassanid Empire was completely annexed, and the dynasty ended.

Expansion out of Arabia

Here is a list of battles which the Caliphate armies won during these years Against Persia:

  1. First wave (633) , under Khalid Ibn Walid,(about 18000 troops)

    • Battle of Chains
    • Battle of River
    • Battle of Walaja
    • Battle of Ullais
    • Siege of Hira
    • Battle of Ein ut Tamr
    • Battle of Muzieh
    • Battle of Sanni
    • Battle of Zumail
    • Battle of Firaz
  2. Second Wave

In 635 Yazdgerd III sought alliance with Emperor Heraclius of the Eastern Roman Empire. Heraclius married his daughter (or, according to some traditions, his granddaughter) to Yazdegerd III, an old Roman tradition to show alliance. While Heraclius prepared for a major offence in the Levant, Yazdegerd, meanwhile, ordered the concentration of massive armies to pull back pull back the Muslims from Mesopotamia for good. The goal was well-coordinated attacks by both emperors, Heraclius in the Levant and Yazdegerd in Mesopotamia, to annihilate the power of their common enemy, Caliph Umar. While Heraclius launched his offensive in May 636, Yazdegerd was unable to muster his armies in time to provide the Byzantines with Persian support. Umar, allegedly aware of this alliance, capitalized on this failure: not wanting to risk a battle with two great powers simultaneously, he quickly moved to reinforce the Muslim army at Yarmouk to engage and defeat the Byzantines. Meanwhile, Umar ordered Saad to enter into peace negotiations with Yazdegerd III and invite him to Islam to prevent Persian forces from taking the field. Heraclius instructed his general Vahan not to engage in battle with the Muslims before receiving explicit orders; however, fearing more Arab reinforcements, Vahan attacked the Muslim army in the Battle of Yarmouk in August 636. Heraclius's Imperial army was routed.

Under Sa`d ibn Abi Waqqas
- Battle of al-Qādisiyyah effectively ending Sassanid rule west of Persia proper. This victory is largely regarded as a decisive turning point in Islam's growth: with the bulk of Persian forces defeated, Saad later conquered Babylon, Koosie, Bahrahsher and Madein. Ctesiphon, the Imperial capital of the Sassanid Empire, fell in March 637 after a siege of three months.

Under Abdullah ibn Muta'am

  • Battle of Jalula
  • Siege of Tikrit

under Qa'qa

  • Battle of Khaniqeen
  • Siege of Hulwan

Qa'qa sought permission for operating deeper into Persian land, i.e. mainland Iran, but caliph Umar didn't approve the proposal and wrote a historic letter to Saad saying:

"I wish that between the Suwad and the Persian hills there were walls which would prevent them from getting to us, and prevent us from getting to them. The fertile Suwad is sufficient for us; and I prefer the safety of the Muslims to the spoils of war."

Khuzistan

After several years, Caliph Umar adopted a new offensive policy, preparing to launch a full-scale invasion of what remained of the Sassanid Empire. The Battle of Nihawand was one of the most decisive battles in Islamic history. The battle proved to be the key to Persia. After the devastating defeat at Nihawand, the last Sassanid emperor, Yazdgerd III, fled to different parts of Persia to raise a new army, with limited degrees of success.

  • Battle of Ishafan
  • Siege of Ishafan
  • Siege of Rey
  • Siege of Sistan
  • Siege of Kerman

The battles won against Byzantines are even more numerous.

I have typed these great lengths to exactly illustrate my point, the magnitude. Some victories can be called turn of situations, some talent of generals, some psychological victories. But, the magnitude of the phenomenon so large, it can't all be thrown to individual reasons. One significant reason maybe instability in Persia, but still the question stands.

Such conquests, and attaining such largeness, takes long and long years of civilizational strides by nations, to have the economy to support, and mobilizing great manpower, or advances in weaponry, or innovative battle tactics, or producing brilliant generals, or strong fealties to the nation, or all of them. The Romans attained that in few hundred years, the Persians with centuries of continuous buildup, the Greeks, with years of growth of philosophy, the mongols, with centuries, before weaponizing their riding skills.

So the question is: What disruption, or innovation, or disruptive innovation did the the advent of Islam bring, and render on the Arabs, that a nation of nomads went up and annihilated Great Empires, conquered great lengths of Earths in such short period of time (again, some 40 years), even just after emerging as a nation? And going on to win against deep rooted civilizations?

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    I admire the documentation. I suspect that you'll find that the answer has a lot to do with "deep rooted civilizations" and the corruption and hypocrisy within such civilizations as opposed to a new, vital religion that provides a ideology that is perceived to be coherent, fair and that is well suited to mobilizing large numbers of military members. – Mark C. Wallace Jul 31 '15 at 13:00
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    Agreed. It probably didn't hurt that for most of those places the invaders were closer culturally to the locals than their own imperial rulers. – T.E.D. Jul 31 '15 at 13:58
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    This could be a very interesting question, but from the questioner's comments to the quite decent answers below, it seem he/she already has some preconceptions and a preferred answer in mind and just wants his or her notions confirmed. Pity. – Marakai May 23 '16 at 2:45
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    @Markai Pity indeed :) Pardon, I am looking for a different page than what the answers present, as I have extensively been through their purveiw – Rohit Aug 15 '16 at 11:22
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    @Rohit I agree wholeheartedly with your comment. It took less than a hundred years for these armies to conquer from the Pyrenees to Punjab, and once conquered, the land and populations were administered for centuries. This is a phenomenon that unique in history, and worthy of an answer better than "The Sassanians and Byzantines were exhausted" – axsvl77 Sep 18 '16 at 5:55
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The critical factor all these answers leave out: The Black Death.

The Plague of Justinian swept through the Byzantine and Sassanid Empires a few generations before Islam. On the Byzantine side, the reduction in manpower available for warfare was near 90%. The damage to the economies of both empires made it unlikely they'd rebuild the population losses quickly enough, and, as @user64617 pointed out, the two were frequently at war with each other anyway.

As to where I get the "90% reduction" figure: Before the Plague, Justinian had sent Belisarius to conquer Italy. Belisarius frequently requested more troops, as cities came over to the Empire's side and he needed to garrison them. He'd request 10,000 -- and get 1,000. After the Plague, Belisarius was again sent to Italy, to fix some problems other generals had created and, if possible, continue the conquest. Again, he'd request 10,000 additional troops -- but this time, all he'd get would be 100. The political events between the two phases did not involve Justinian -- he was sick with the plague -- and his personal attitude towards Belisarius, and his intent to rebuild the Empire, had not changed.

(This doesn't mean 90% of the population died; it means enough people died that 90% of those who would have been available for the armies instead were needed for farming, shipping, trades, etc.)

Sources: Belisarius, the Last Roman General by Ian Hughes; Justinian's Flea by William Rosen.

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    The extrapolation from the size of troops sent in two particular military expeditions (even if they were similar) to the whole military power of the Byzantine Empire is, to say the least, far-fetched. – Evargalo Apr 27 '18 at 8:51
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    It was the same campaign, same general, same emperor. Belisarius had been sent into exile by Theodosia, but reinstated and sent back to Italy once Justinian recovered and understood the state of Italy under the other generals. Constantinople itself lost 40% of its population to the plague, the Mediterranean basin around 25%; I don't think it's far-fetched to see a 90% reduction in available, fit men for military service. But fair enough critique; it is an extrapolation. – Rob Crawford May 1 '18 at 14:53
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    My research suggests that there were several waves of the Plague of Justinian, right up until the early 8th Century. I believe that supports this argument. – Pieter Geerkens Jun 29 '18 at 15:49
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    @sofageneral The plague of Justinian was also caused by Y. Pestis. – sempaiscuba May 16 at 0:36
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    @sofageneral i suspect that'll be why the answer says "... a few generations before Islam"? – sempaiscuba May 16 at 16:27
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  1. Long lasting wars between Sassanians and Byzantine empire had made cripple armed forces of both of them and made their borders vulnerable.
  2. Lakhmids were acting as a buffer state between nomad Arabs and Persia. But Khosrow II made them into neutral force practically. the practice made Iran's southern border more vulnerable.
  3. Kavadh II massacred a lot of members of royal family, so it led to a internal crisis some years before Arab's invasion.
  4. Remember, both Persia and Byzantium had wide borders in north and east and west with various enemies. They had to divide their troops along all the borders.

Reference: *The Arab Conquest of Iran and its aftermath*: in Cambridge History of Iran, Vol 4, London, 1975.

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Byzantium and Persia were both greatly weakened by titanic wars they had fought with each other during the reign of Heraclius - at one point Byzantium was surrounded, and at another Heraclius was taking Persia's capital city.

But aside from that, there was a structural weakness in the Eastern provinces near where Islam was being born - the Monophysite Schism:

After the fall of Rome, the Byzantine Empire became the center of both political and religious power. The political and religious conflict between the Copts of Egypt and the rulers of Byzantium began when the patriarchate of Constantinople began to rival that of Alexandria. The Council of Chalcedon in 451 initiated the great schism that separated the Egyptian Church from Catholic Christendom. The schism had momentous consequences for the future of Christianity in the East and for Byzantine power. Ostensibly, the council was called to decide on the nature of Christ. If Christ were both God and man, had he two natures? The Arians had already been declared heretics for denying or minimizing the divinity of Christ; the opposite was to ignore or minimize his humanity. Coptic Christians were Monophysites who believed that after the incarnation Christ had but one nature with dual aspects. The council, however, declared that Christ had two natures and that he was equally human and equally divine. The Coptic Church refused to accept the council's decree and rejected the bishop sent to Egypt. Henceforth, the Coptic Church was in schism from the Catholic Church as represented by the Byzantine Empire and the Byzantine Church.

For nearly two centuries, Monophysitism in Egypt became the symbol of national and religious resistance to Byzantium's political and religious authority. The Egyptian Church was severely persecuted by Byzantium. Churches were closed, and Coptic Christians were killed, tortured, and exiled in an effort to force the Egyptian Church to accept Byzantine orthodoxy. The Coptic Church continued to appoint its own patriarchs, refusing to accept those chosen by Constantinople and attempting to depose them. The break with Catholicism in the fifth century converted the Coptic Church to a national church with deeply rooted traditions that have remained unchanged to this day.

By the seventh century, the religious persecutions and the growing pressure of taxation had engendered great hatred of the Byzantines. As a result, the Egyptians offered little resistance to the conquering armies of Islam.

Many of the differences in outlook the Monophysites had with the home chuch were reflected in Islam, and Islam, at least at first, was less interested in how these schismatics wanted to worship than the persecuting church in Constantinople. And also, the simpler Islamic state required fewer taxes than they had to pay to Byzantium. So once the army was beaten, there was little resistance to further conquest by the Arabs, and as provinces fell the Byzantine and Persian states became weaker still.

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    @KorvinStarmast That's not a very valid analogy (Healthy 25 YO beating up a 70 YO drunk). The 70 YO drunkards were humongous and would have crushed the the puny 25 year olds as easily as one would swat a fly. Byzantium effectively showed that once they had recovered from the "first shock". Personally I blame the officers and nobles of both Empires who underestimated the threat facing them. Also the tactical differences. The Empires were focused on static pitched warfare, Arabs brought with them a mobile doctrine of medieval blitzkrieg. Empires weren't trained for this kinda fighting – NSNoob Jan 3 '17 at 7:10
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    Same thing happened with Arabs themselves when they became too focused on static doctrine as established empires tend to do. Mongols brought another mobile doctrine with them and Arabs simply couldn't handle them. If not for bold pre-emptive strike of Sultan of Egypt and conversion of Golden Horde to Islam, Mongols may have even wiped out all what we know today as heartlands of Muslims. – NSNoob Jan 3 '17 at 7:12
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    You might find my previous answer interesting in this regard. I am thinking about building an answer along those lines but doing justice with a question like this takes a lot of time and research. If you think it's plausible and want to build on it, feel free. – NSNoob Jan 3 '17 at 7:14
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Maybe we can bring the explanation given by an Arab historian, Ibn Khaldun, in its Muqaddimah and the theory of Asabiyyah to get a good insight (Peter Turchin works might be a good introduction as well).

Asabiyyah is the group cohesion, that makes people work together for a purpose. All civilizations while growing have a strong group cohesion, which is the willpower required to pass over obstacles to reach a goal. When this group cohesion is lost, people no longer is interested on fighting for its government, because they no longer feel attached to it.

What happened during the Arab conquest is that Islam gave both cohesion and purpose to desert tribes (that already had a important cohesion within its tribes), and while they advanced, they not only won battles, they won hearts. They did not conquer their enemies, they just replaced weak powers that did not have enough cohesion with their own people. Since in those days Islam respected other cultures, common folks did not have anything to be afraid of Arabs, except their taxes to non Islamic people.
Byzantium probably survived only because geography.

Same thing happened to Western Roman Empire during its fall, their people no longer had motivation to fight for that empire. The same empire that centuries before, after losing battle after battle against Hannibal, had enough willpower to keep fighting, because they had group cohesion, a purpose, asabiyyah.

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Answer from u/lcnielsen at the AskHistorians post Is there a pattern to previously harmless tribes conquering vast lands, or am I seeing one where there isn't any?

So it is always tricky to work with these questions that span such vasts amounts of time and space, but speaking with respect to the empires I am familiar with, I don't think you are entirely mistaken.

There are two patterns arguably at work here, one of which your premise explicitly denies: tribes were not necessarily "harmless". Many possessed what is called the nomadic advantage, namely, a lifestyle that resulted in the average man (and in many cases women as well) possessing a skillset and attributes that made them potentially excellent soldiers. Even in cases where the tribes were not nomadic, this still applies to some extent. Exactly which attributes these were varies with the group and author, but a couple of commonly mentioned one:

  1. Lack of permanent settlements, leading to various survival skills and self-sufficiency.

  2. A "martial lifestyle" potentially including both traditional martial arts, horsemanship, and value placed on skills with weapons such as the bow, which may also be important to survival (e.g. for hunting).

  3. Experience with raiding. Many such groups were to some extent dependent on settled populations for luxury goods and surplus food. These could be attained through trading, but also by plundering settlements or outposts if trade was not profitable enough. Often, the merchants and the raiders were one and the same (in some cases, as with the vikings along the Volga river, they could be intimately tied together - raid one settlement for slaves, then sell the slaves elsewhere).

  4. A high value placed on personal honor, oaths and covenants, and/or a strong notion of masculinity tied to proficiency in the above three categories, often defined in opposition to the "meek" and effeminate settled populations. (A personal observation is that many such groups - Arabs, Germanic peoples, etc, also seem to have possessed a strong sense of legalism, which I suspect to be tied to the idea of personal honor being important, but perhaps also to the kind of social structures needed to maintain some manner of social control against vast and inhospitable lands.)

Compared to an army mostly composed of levies from settled populations, nomads could be absolutely devastating. They were not invincible - when faced with a comparably sized group of martial elites or professional soldiers, such as with the Mongols against the Mamluks at Ain Jalut, and perhaps with the Umayyad armies in Gujarat, they could absolutely be defeated (even crushingly). But that requires a strong opponent with a particular set of social institutions, and of course, like anyone else, nomads prey on their enemies when weakened. (It has to be asked though, that if the Khwarezm-Shah had taken the Mongol threat seriously and marshalled the full strength of his Mamluk forces, would he not have stood a good chance against Chinggis Khaan?)

The second pattern has to do with the effect of empires on surrounding populations. Consider the quintessential empire of antiquity, that dominated its surroundings to extents unheard of. I am of course talking about the Achaemenid Empire (what, you thought I meant Rome?). Following and preceding their fall, what do we see in the world around them? We have Porus around the Kush, and the Maurya Dynasty for the first time uniting almost all of the Indian subcontinent (and Sanskrit also acquiring a writing system by way of the Achaemenids). We have the Scythians and Xiongnu of the Steppes. We have Macedonia in Greece (once an Achaemenid client state). Carthaginians in Northern Africa, Kushan in East Africa. Why do we see the emergence of such powerful states around the fringes of the Achaemenids? Well, the nature of an empire seems to leak outside its borders - not only does a stable empire mean profitable trade routes from aboard, but also the spread of imperial ideology, structures of social hierarchy, and the opportunity for local elites to use their powerful neighbour to leverage control over their local territory. Though they do not fit into the pattern of being nomads, such a spread of ideas, tradition, wealth and so on is notoriously obvious in Classical Greece, in spite of their successful repelling of Persian armies. (Perhaps the Perso-Elamite kingdom of Anshan, neighbour to the great Neo-Assyrian realms, that would found what was to become the Achaemenid Empire, would be another apt example.)

Tying these two together, an empire not only means that the nomads could get rich from trade and raiding more prosperous trade outposts than ever, but also that they have a powerful neighbour willing to hire them as mercenaries, resulting in experience with military organization and potentially further spread of ideology. I don't know whether one should count the Achaemenid use of Greek mercenaries to this, but it was certainly the case that the Sasanians and the Romans both used Arabic (and Turkic) mercenaries; and in more recent times, the Qajar and Afsharid tribes were both used by the Safavids as an important source of military power; both would later rule Iran. And the use of "Romanized" Germanic chieftains (such as Flavius Odoacer himself) as military commanders by Rome I doubt I need to speak of at length.

By nature, any search for broad patterns will be speculative in nature, and studying nomadic and "tribal" groups comes with the inherent problem of poor records. Moreover, specialists in any area will always be able to point to ways in which their time and place of expertise deviates from the idealized pattern. Nevertheless, the social and economic dynamics at work certainly seem to be valid for a vast swathe of the past 2500 years!

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Question: So the question is: What disruption, or innovation, or disruptive innovation did the advent of Islam bring, and render on the Arabs, that a nation of nomads went up and annihilated Great Empires, conquered great lengths of Earths in such short period of time (again, some 40 years), even just after emerging as a nation? And going on to win against deep rooted civilizations?

The disruption or innovation was organization, motivation fed by religious fanaticism on a scale and ferocity unmatched at the time by any of their neighbors. If we compare Christianity over it's first 200, 400, or 1000 years with the achievements of Islam over it's first 100 years their simple is no comparison. Christ was a pacifist and left his followers with that teaching and for the first five hundreds of years Christianity would be largely splintered and aimless. Over the first 1000 years Christian Kingdoms of western Europe would still be rooted in the dark ages. Alternatively Mohammed was a warrior who taught his followers not only were wars necessary, but demanded by god to spread the faith. Within 100 years of Mohommed's death, The Islamic Kingdom or Caliphate was already into it's golden age. Organization, motivation, and clarity of vision.

The Question asks specifically about the first wave of Islamic expansion and dates that too 633 AD under Khalid Ibn Walid. But fails to mention that Mohammed died in June 8, 632 AD, the previous year, and that Mohammed spent the last 10 years of his life fighting wars to unify the Arabian Peninsular and spread Islam. When Mohammed died his followers were already militant and organized for expansion. It was understood wars were synonymous with spreading the faith, and that's how Islam expansion was pursued through conquest. Conquest at the expense of infidels. Christianity too followed this same pattern but not nearly as quickly. Islam was much more focused early on and frankly infinitely more organized.

The battles being discussed in the question were religious wars against infidels. While early Christianity had religious wars. The Emperor Constantine famously used the cross as his standard riding into battle at Milvian Bridge (Oct 28, 312 AD). The difference was the folks fighting for Constantine under the sign of the cross were not Christians and neither was Constantine until his deathbed. Christians in Constantine's time (Feb 27, 272 AD - May 22, 337 AD) were pacifists not soldiers. Constantine's attempt to recruit Christianity's "fanatics" to Rome's needs thus had very mixed results. Christians weren't unified. Rome spent the first 200 years after elevating Christianity from an underground criminal pursuit to a legal respectable religion, fighting wars against different Christian factions over matters of small doctrine. Early Christians made poor soldiers and their utility to Rome was very mixed. Not so for early Moslems, Mohammed their prophet left them with a blueprint on Islamic expansion and it was about war against non believers.

The largest display of militant Christian fanaticism would be the crusades. Which were a mirror and reaction to Islamic militant religious fanaticism. First Crusade (1095–1099) was a call by Pope Urban II to recapture the holy lands which had fallen to Islam in the 7th century.

So what was Islam's innovation? The ability to touch people, recruit and motivate people to fight harder and longer than anybody they went up against until perhaps the crusades, but certainly the Mongol invasion of the Caliphate.

A potent and attractive religious package with militant fervor built-in. It would be centuries before Islam encountered a similar militant religious package facing off against them.

  • The 'fanatics' angle seems a bit too dominant here. May I recommend the school of thought & inquiry to which I'd group Fred McGraw Donner: "The Early Islamic Conquests"? My criticism of that angle is grounded an over-reliance of that angle on late writings of theological origin for the history, here in a believers narrative of Christians vs Moslems. That is popular, true, but may be too simple. – LаngLаngС May 16 at 23:49
  • @LangLangC Many religions have gone through a fanatic or zealot phase (Christianity Judaism, Hinduism Buddhism). I don’t really understand why anybody would dismiss that Islam experienced this same phenomena in there first century expansionist phase (see Kharijites). – JMS May 17 at 1:55
  • @LangLangC Maybe it’s not PC and I did not mean to compare Islam unfavorable to Christianity but to point out Islam started out with many advantages on Christianity with regards to expansion. Both experienced militaristic expansion Islam just was better at it sooner. As they were better at governance early on probable for many reasons. Aren’t all religious wars due at least in part to religious fanaticism. – JMS May 17 at 2:05
  • Na, 'PC' or not, don't care. Although, Donner would have beena sort of compromise. Perhaps start here and then look for German & Dutch members to see what I mean, and perhaps see an angle that's probably not very PC. Not saying that 'they know the truth' or sth, but just for comparison. Esp with Huns, Vandals, Vikings, Mongols? – LаngLаngС May 17 at 8:01
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    @LangLangC thank you I’ll check it out. – JMS May 17 at 11:59

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