I recently got hold of a book about Myles Keogh, a captain in Custer's Seventh Cavalry who for many years was best known for the fact that his horse Comanche survived the Little Bighorn (Keogh didn't). Turns out he "sailed away from Liverpool quay on board of the Kangaroo" on March 19, 1862, headed for the American Civil War, where he made a name for himself fighting with McClellan, Buford and Stoneman.