I forget the name, but it was on Red Faction Guerilla...
Fuckin' awesome four on four game where the flags are surrounded by buildings, there are four or five walls lying across the map, and more explosive weapons than you can shake your hammer at.
It got chaotic, and it would always be funny, running through a hole in the wall and getting nailed in the head by someone elses hammer...
By the end though, most or all of the walls, buildings, and people would be crushed...