In Europa Universalis II, "bouncing" is a tactic wherein the bulk of a siege force moves during a month. A cover force holds the siege during the time in which the main siege force is elsewhere. Bouncing a siege makes it possible to advance two sieges using two cover forces, and one additional force large enough to siege. A second use for bouncing is to reduce attrition in a siege which is taking place in a province which cannot support a siege force without attrition.