After the victory over the army of Parliament under Lord Fairfax and Sir Thomas Fairfax at the Battle of Adwalton Moor on 30 June 1643, the Earl of Newcastle advanced with the main northern Royalist army into Lincolnshire. At this point in the Civil War, Royalist fortunes were high, and Newcastle's advance joined Lord Hopton's and King Charles' armies in a three-pronged advance on London.