The 13th Maine Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War. The regiment spent 1862–1864 in the Department of the Gulf and finished the war with the Army of the Shenandoah. During its service, it survived a hurricane off the Carolinas en route the Gulf of Mexico, manned the forts guarding the Mississippi Delta, invaded Texas at the Rio Grande and along the coast, fought in Banks' ill-fated Red River Campaign in Louisiana, manned Washington DC defenses, and provided rear-area security for the Shenandoah Valley campaign in 1864 south of Harpers Ferry.