Tensions in Johnson County remained high. On May 10, U.S. Marshall George Wellman, was ambushed and killed by locals en route to the small community of Buffalo. The incident received national attention, with Wellman being the only marshal to die in the war. Wellman was one of the hired guns who joined the Invaders, and his death was grieved by a large crowd. The 6th Cavalry, sent to relieve the county of its violence, was said to be influenced by intense local political and social pressure, and they were unable to keep the peace. One infamous event occurred when a group of men set fire to the Post exchange and planted a homemade bomb in the cavalry's barracks. Noted officer Charles B. Gatewood was seriously injured by the bomb blast in the barracks, shattering his left arm and ending his cavalry career.