Operation Off Balance was a hastily planned offensive operation of the Laotian Civil War; it happened between 1 and 15 July 1969 on the Plain of Jars in the Kingdom of Laos. The Royal Lao Government forces in Military Region 1 of Laos had just been evicted from the crucial all-weather airfield at Muang Soui, as well as most of the Plain, on 28 June 1969. Hmong General Vang Pao planned a quick counter-offensive to recapture the airfield from his communist foe; it would kick off on 1 July, supported by 60 sorties per day of tactical air strikes from Operation Barrel Roll.