Three female RAF recruits awarded £100,000 payouts for marching injuries.

[AngryAmish]

16. Marching is way older than guns

Greek Hoplite fighting consisted of gathering up the farmers from your area, lining up against the other farmers, walking into each other and trying to shove them down, en mass, and stab them with your long spear. If you can march in formation then you have a decided advantage on the battlefield (way back in ancient greece). This carried on in place with standing armies -first Sparta. the Macedon phalanx, Roman infantry, to the shield walls of the Vikings, Saxons and Normans (Battle of Hastings!).

It continues to build unit cohesions, get people used to following orders and other reasons stated in this thread.