Ammo crates restock at the end of each wave. These items can be picked up once and, with the exception of ammo crates, will not replenish, so it is strongly advise for all players to be well-stocked on both ammo and equipment before launching Call to Arms. Scattered throughout the map are various weapons, ammo crates and healing items for the player(s) to use. When initially spawning in, all players will retain whatever weapons and equipment they had equipped prior to launching the game mode and will be given 5 minutes to prepare for the coming onslaught. Five locations are currently available: Blackwater, Fort Mercer, Valentine, Strawberry, and MacFarlane's Ranch. In Call to Arms, up to four players are tasked with defending a town or settlement from 10 waves of incoming enemies by killing them while keeping both themselves and their allies alive.

After this, the game mode can be launched at any time by selecting the associated telegram in the Satchel. In order to gain access to Call to Arms, one must either check their Camp Lockbox or go to the nearest Post Office to find a telegram named 'Call to Arms' from a person simply referred to as 'J'.

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