Minefields are parts that are usually outside the map, that will kill any player stepping on them by blowing them up with a buried mine. They are used to keep the player inside the boundaries of the map, similar to invisible walls or Radiation Zones used in other games. The fields are marked by signposts with a skull and crossbones on it. Minefields are also encountered in campaign, killing players when they step on it.
Call of DutyEdit
In Call of Duty, they are used to keep the player(s) from exiting the map. They can be found on many of the multiplayer maps in the game.
Call of Duty: World at WarEdit
In the mission "Little Resistance", there is a minefield accessible via noclipping and a second one that can be accessed by legitimate means. The second one is to the left when the player is about to reach the first bunker that a Marine is about to attack with an M2 Flamethrower. It is indicated by signs with skulls on them. The location of the first minefield is unknown.
Call of Duty: Modern Warfare 2Edit
In Call of Duty: Modern Warfare 2, they are used in the mission "Loose Ends". At the beginning of the mission, one of the player's objectives is to pass the minefield, by going prone, to avoid being killed by a mine. They appear as Bouncing Betties.
Call of Duty: Black OpsEdit
In Call of Duty: Black Ops, they are seen on the multiplayer map, Jungle, in front of a large rice paddy in the back of the map. If a player walks into these paddies, a mine will detonate, killing them.