Atlantic was a wooden-hulled, side-wheel steamship launched in 1849. She was conceived as a part of an American fleet which would break the monopoly that European steamers, notably the Cunard Line, had on trans-Atlantic trade. She was the most successful of the Collins Line ships, and one of the most luxurious vessels of her day, but the company went bankrupt in 1858. After the war, Atlantic was primarily used to bring German immigrants to the United States. Over the course of her career, Atlantic completed sixty-six trans-Atlantic roundtrips, more than any other American side-wheel steamship.