General at Chickamauga was a title given to Major General George Henry Thomas, an American Civil War general who served in the Union Army. He is best known for his leadership at the Battle of Chickamauga, where he held off Confederate forces and earned the nickname 'The Rock of Chickamauga'. Sheridan (8 letters) was Philip Sheridan, another Union Army general who was known for his successful campaigns against Confederate forces in the Shenandoah Valley.