Teams are split into Attackers, who have a limited number of respawn tickets available for the whole team, and Defenders, who have an unlimited supply of tickets available. The objective of this game mode is to arm and destroy two Gold Crates in Bad Company, or M-COM Stations in newer installments, with an explosive charge.
If the charge is placed, an alarm will go off and the charge will flash red lights, alerting the Defenders of it while it arms for thirty seconds. When the charge gets to the last few seconds of arming as it primes, the alarm will switch to a ring that raises in pitch until the charge explodes.
Once both objectives are destroyed at a base, Defenders have a few seconds to fall back to the next base, with the former effectively becoming the Attacker's new deployment.
The number of bases is different depending on the map, with at least three sets of Crates or M-COMs per map and as many as five. Once all objectives have been destroyed, or all the attacker's tickets have run out, the round ends.