Answer
Margaret Cavendish's husband, William Cavendish, was a commander in the First English Civil War. He fought in the Northern English campaign, which was a series of battles between the Royalist and Parliamentarian armies. The Royalists were led by King Charles I, while the Parliamentarians were led by Oliver Cromwell. The Northern English campaign was one of the first major battles of the war, and it ended in a Royalist victory.