This game type requires a good defensive position, preferably a house that's abandoned or under-construction.
Members of the defending team only have 1 life, but are given (slightly-moderately) superior weaponry, and a good defensive position.
Attackers get multiple lives, but must go back to a respawn point before re-entering the battle.
Eventually the attackers will win, but the defenders should be able to take out wave after wave of attackers.
How to Keep Score
Divide your players into 3 teams, ie 18 combatants = 3 teams of 6. One team defends, and 2 teams work together to attack. Record the number of kills the defensive team makes, and the amount of time they are able to hold out. Rotate each of the teams through defense. After each team has rotated through, compare the # of kills/time each team makes to determine a winner.
There's an abandoned house at a state park near my house in NC. I'm seriously considering trying this out over my mid tour leave. What do you guys think?