Pocket (military)

The eastern front at the time of the Battle of Moscow

A pocket is a group of combat forces that have been isolated by opposing forces from their logistical base and other friendly forces. In mobile warfare, such as blitzkrieg, salients were more likely to be cut off into pockets, which became the focus of battles of annihilation.

The term pocket carries connotations that the encirclement was not intentionally allowed by the encircled forces, as it may have been when defending a fortified position, which is usually called a siege. That is a similar distinction to that made between a skirmish and pitched battle.