Price, along with Confederate regulars and members of the Arkansas State Troops, defeated a smaller Union force under Nathaniel Lyon at Wilson's Creek on August 10, killing Lyon and driving back his army. Price, with 10,000 men, defeated a 600-man battalion of Kansas volunteer cavalry led by Senator James Lane at Big Dry Wood Creek on September 1–2, and then besieged and captured 3,600 Federal troops in the First Battle of Lexington (Battle of the Hemp Bales) in mid-month. As Frémont's Union army finally advanced toward Springfield, the Guard withdrew. A bold dash by Major Charles Zagonyi's mounted vanguard routed local MSG troops waiting in ambush on October 25, 1861, at the First Battle of Springfield. Fremont's offensive was subsequently recalled before engaging the main southern force when Fremont was relieved from command by order of President Lincoln.