Ohioans first had military action at the Battle of Philippi Races in June 1861, where the 14th and 16th Ohio Infantry participated in the Union victory. Ohioans comprised one-fifth of the Union army at the April 1862 Battle of Shiloh, where 1,676 Buckeyes suffered casualties. Ohio would suffer its highest casualty count at the Battle of Chickamauga in September 1863, with 3,591 killed or wounded. Another 1,351 men were taken prisoner of war by the Confederates. Among these prisoners, 36 men from the 2nd Ohio Infantry would perish in the infamous Andersonville prison, as did hundreds more Buckeye soldiers there.