Union Army of the West
Brigadier general William S. Harney, who had left Lyon in temporary command, returned to St. Louis with two companies of Union artillery and two companies of Union infantry. He reassureed the citizens of St. Louis that the Union army would protect them. He condemned the actions of the state legislature and governor in making any effort to join the Southern cause. He also wrote to General Scott saying he approved of Lyon's actions. On May 17, 1861, Lyon was promoted to the rank of brigadier general, his date of rank being 18 May.