Victory disease denotes when in military history, because of complacency or arrogance brought on by a victory or series of victories, an engagement ends disastrously for a commander and his forces. A commander may disdain the enemy, and believe his own invincibility, leading his troops to disaster. That commander may employ strategies which, if effective in earlier combats or maneuvers, prove catastrophic against a new or smarter enemy; the commander afflicted by "victory disease" may also fail to anticipate a new enemy may use tactics different from those of old enemies. An overconfident commander may disregard military intelligence which would enable the commander to realize that new tactics are needed.