well duh.. it's kinda called, CAPTURE THE FLAG.... well neways, do it with zerglings if anyone does do it.
Zerglings for the ppl, two jails, and flags that are randomly positioned between 3 "beacons" on the edge of the maps, (Probably a forest mapw ould be the best look of it, with some ups and downs)
If a playe r is "tagged" or isn't helping their team, they are sent to the opponent jail (surrounded by something destructible that re-makes itself after each freeing) then if a team-mate gets into the jail, suddenly the walls blow up, the team in jail becomes invincible (except the free-er) and then they walk back, the free-er runs away like crzy, and the jail walls re-appear. (The invincible people become constantly ordered across so players cant run away from the crossing invincible.)