Semaphore pointed out historical examples. I believe the context (thank you for providing the link) also helps. The following are all quotes from that same speech.
The disastrous military events which have happened during the past fortnight have not come to me with any sense of surprise.
The Admiralty had confidence at that time in their ability to prevent a mass invasion even though at that time the Germans had a magnificent battle fleet in the proportion of 10 to 16....
Now, the Navy have never pretended to be able to prevent raids by bodies of 5,000 or 10,000 men flung suddenly across and thrown ashore at several points on the coast some dark night or foggy morning.
Some people will ask why, then, was it that the British Navy was not able to prevent the movement of a large army from Germany into Norway across the Skagerrak?
Can we break Hitler's air weapon?
There remains, of course, the danger of bombing attacks, which will certainly be made very soon upon us by the bomber forces of the enemy. It is true that the German bomber force is superior in numbers to ours; but we have a very large bomber force also, which we shall use to strike at military targets in Germany without intermission.
In what way has our position worsened since the beginning of the war? It has worsened by the fact that the Germans have conquered a large part of the coast line of Western Europe, and many small countries have been overrun by them.
If Hitler can bring under his despotic control the industries of the countries he has conquered, this will add greatly to his already vast armament output.
We must not forget that from the moment when we declared war on the 3rd September it was always possible for Germany to turn all her Air Force upon this country, together with any other devices of invasion she might conceive, and that France could have done little or nothing to prevent her doing so.
Over and over again, Churchill addresses the losses they have suffered and the dangers they face from Germany's military might. These losses would not be so severe if German technology were not on par with that of the Allied powers.
What General Weygand called the Battle of France is over. I expect that the Battle of Britain is about to begin. Upon this battle depends the survival of Christian civilization.
Being caught in a terrible war, the enemy is evil (even if he also claims to be Christian) and any technology or science he uses is considered a perversion of that technology and science.