Good idea for a game:
Team A must place mortars at a zone (can be any they choose), it will the be announced (over radio ro other means) that the mortars are in place, the mortars can attack any zone once (the one they think the ammo dump will be on), once mortars are fired, all players in the zone they have fired on are classed dead and must go back to the safe zone for 5 minutes, then re-spawn. The mortars however once played, take 15 minutes to fire. So this means Team A must protect the Mortars for 15 minutes before they can fire.
Team B must try stop any mortar placements, small patrols well be sent out to get intel on were the mortars have been placed. If mortars are placed a team must be sent out from the main base (some players must say behind in a zone to protect ammo dump), the team sent out must take over the enemy zone, and disable the mortars, once disbaled, the mortars are go to back to the safe zone for 5 to 10 minutes, before they a respawned to Team A.
Patrols sent out can be captured, and held captive for 5 minutes before being respawned into the game, that means the patrols must use stealth to find out what the enemy is up 2, the patrol can only open fire once the enemy has shouted that they have spotted the patrol.
There are obv some things that can be worked on, however, it would be a very good objective for a game. The mortar can be a tube of some kind, just so people know what it is.