gavin lies alongside such american soldiers as george armstrong custer , the legendary indian fighter killed on june 25 , 1876 , along with 200 soldiers of the 7th cavalry in the battle of the little big horn ; gen. winfield scott , hero from the war of 1812 and the commander of union forces at the opening of the civil war ; robert anderson , who defended fort sumter in the opening battle of the civil war ; and astronaut edward white , the first american to walk in space , who died during a flash fire aboard the apollo i space capsule .