Raid, also known as depredation, is a military tactic or operational warfare mission which has a specific purpose and is not normally intended to capture and hold terrain, but instead finish with the raiding force quickly retreating to a previous defended position prior to enemy forces being able to respond in a co-ordinated manner or formulate a counter-attack. A raiding group may consist of combatants specially trained in this tactic, such as commandos, or as a special mission assigned to any general troops. Raids are often a standard tactic in irregular warfare, employed by warriors, guerrilla fighters, or other irregular military forces.