 The largest battle in the campaign to evict Jackson was the Battle of Wilson's Creek near Springfield, Missouri, on August 10, 1861.The battle marked the first time that the Missouri State Guard fought alongside Confederate forces.A combined force of over 12,000 Confederate soldiers, Arkansas State Troops, and Missouri State Guardsmen under Confederate Brigadier Benjamin McCulloch fought approximately 5,400 Federals in a punishing six-hour battle.