Union forces under General Nathaniel Lyon and General Franz Sigel attacked Confederate forces under General Sterling Price and General Ben McCulloch along Wilson's Creek in Missouri.  The Confederates won a tactical victory, but most of them returned south into Arkansas, leaving Price to hold the state of Missouri.  Union General John C. Fremont issued a proclamation confiscating the property of all Missourians who fought for the Confederacy, including freeing their slaves.  President Lincoln rescinded his order.