The Battle of Marston Moor took place on July 2, 1644, during the English Civil War. It was a significant conflict between the Royalist forces, loyal to King Charles I, and the Parliamentarians, who opposed the king's rule. The battle occurred near York and involved a large number of troops, making it one of the largest battles of the war. The Parliamentarians, led by Oliver Cromwell and Lord Fairfax, achieved a decisive victory, which greatly weakened the Royalist position in the north of England. This battle marked a turning point in the war, boosting the morale of the Parliamentarians and contributing to their eventual success.