That was for most the troops in greek and roman times. The heads of military encourage the soldiers to love one another in the troops.that one of the reasons why Spartans fought well beside their fellow soldiers. And the usa has adopted this strategy as well, not loving your fellow soldiers but having a family. Before ww1 this strategy was put in place because who wants to go to war and not have a reasonable cause to go.
Spartans. I mean, you did watch 300, yes? Who'd march into war, risk their life every 3 minutes and decide NOT to have a piece of that ass while they still can? ( ͡° ͜ʖ ͡°)
f*** you