What decides who goes in the front rank in a line infantry formation?

Question

In an infantry formation, the front ranks seems to have much higher chance of being killed because they are exposed to the enemy front.

This thread explains how soldiers are arranged in Roman military formation. In the 18th-19th century era line infantry, what usually decides who goes in front? It seems unfair if just one person has to be in front all the time.. And if there is any consistent rule, how is it enforced? Or there is no preference at all, so it just depends on luck whether you get the front rank or not?

To clarify, I'm especially interested in the personal (the soldier) point of view regarding this, i.e. why they would want to be in what must be an unfairly disadvantaged position, but some insight about the tactical consideration is also welcome

Answer 1

From what I learned in military strategy classes in OCS, the line infantry for pretty much all militaries in the 18th and 19th centuries consisted primarily of ill-equipped, poorly trained conscripts. These were men who either chose the military rather than going to prison, or enlisted because there was no other job to be had. Either way, the one thing they all had in common was that they were expendable.

In those days, it was typical to send in a line of infantry to test the strengths and weaknesses of your enemy. Since these foot soldiers were expendable anyway, you could march them out to see where the enemy had their cannons placed and to see what kinds of weapons they might have available. It also helped to reveal certain formations that may not have been obvious. It also sometimes served to give you an idea as to how motivated or experienced your enemy might be.

In some militaries, they had such overwhelming quantities of line infantrymen that they could simply use them to overrun enemy emplacements. Once they had managed to break through the opposing lines, the better trained troops and/or cavalry would follow them through and engage the enemy's more elite troops.

(If you ever wondered where the term "cannon fodder" came from, it was these types of front line troops.)