Alliance Wars are a feature in Call of Duty: Heroes. It takes place over 72 hours, or three days, and is also carried out over three stages.

  • Day 1: On day 1, the alliance members are prompted to prepare their base for battle.
  • Day 2: On day 2, the alliance members battle, attacking the opponent alliance members' bases.
  • Day 3: On day 3, each alliance reviews its rewards, and recovers from the war.

To start an alliance war, the player must be either a Captain or Commander in their alliance, and the alliance must have at least 10 members. The player may send and request reinforcements during an alliance war.