Texas seceded from the union on February 1, 1861, and on February 14, McCulloch received a colonel's commission from Confederate President Jefferson Davis, with the comment that "to Texans, a moment's notice is sufficient when their State demands their service." He was authorized to demand the surrender of all federal military posts in the state. Subsequently, on the morning of February 16, U.S. Army General Twiggs, finding that more than 1,000 Texas troops had surrounded his installations in an orderly manner during the night, turned over to McCulloch all federal property in San Antonio. In return Twigg's troops were to be allowed to leave the state unharmed. On May 11, President Davis appointed McCulloch a brigadier general.