Whereas Active Defense envisioned the Army units moving from one blocking position to another in a series of largely static defenses, in the counter-blitz they would be far more mobile, conducting a series of limited offensives instead. Another difference was the role of the reserves; under Active Defense their role was very limited and even battlefield reserves were expected to be placed directly in the front, but under Patterns the reserves could be introduced where and when they became available, and be just as effective as the troops that had been there from the start. Boyd felt that the continual pattern of harassment and shifting positions could continue throughout a conflict, as opposed to attempting to win the entire war at the front in a single battle.