War is hell, and war in the warrens is even more hellish since most of the battles play out in tunnels underground.
But, as Watership Down showed us, when there is unhoppiness in the rabbit community it can lead to all out war, turning rabbit against rabbit in a blind battle for survival.
POILUS was created by ISART DIGITAL, the name derived from the informal term for the infantry soldiers of the French army who fought in WWI.
https://www.youtube.com/watch?v=9wncS6tO59M
in this case they are rabbits because USA GI => usagi => rabbit in japanese
the original is manga set during Vietnam and the sequel is set during the '80 cold war era