Take about 10%-20% of the players and designate them as the Germans and put them in and vantage area, somewhere up high or behind buildings and make it so they can't leave a certain border. The Germans must defend against the onslaught of Americans until time runs out.
-Germans can only be eliminated by headshots/maskshots. Anywhere else doesn't count.
-Americans are sent out in waves of 5-10 (Depending on size of group) every minute to minute and a half.
-Americans can only go within a small border leading straight towards the Germans to create tight and fast combat.
-When an American get eliminated, they head to the dead zone, clean off, refill on paint and get in line to be in the next squad.
-Germans win if they defend for 10 minutes. (Time depending on group size)
-Americans win if they can eliminate every German within the time limit.
I'm so bored I even made an example diagram.
- Nobody can enter this area.
- Area Germans are allowed to move in.
- Americans can't go passed here.
Black - Imaginary bunkers.
- Dead zone/entrance
We play this at my local field all the time and it's great, everyone loves it, renter and gun owners.