By the time of the Battle of Marston Moor in July 1644, Cromwell had risen to the rank of Lieutenant General. The success of his cavalry in breaking the ranks of the Royalist cavalry and then attacking their infantry from the rear at Marston Moor was a major factor in the Parliamentarian victory. Cromwell fought at the head of his troops in the battle and was slightly wounded in the neck, stepping away briefly to receive treatment but returned to help force the victory. After Cromwell’s nephew was killed at Marston Moor he wrote a famous letter to his brother-in-law. Marston Moor secured the north of England for the Parliamentarians, but failed to end Royalist resistance.