Ormonde was forced to surrender Dublin to the Parliamentarians (July 1647), and the inextricable knot awaited Cromwell's sword.
Rupert had relieved York and joined forces with the marquess of Newcastle's army that had defended that city, and the Parliamentarians and Scots who had besieged it had drawn off south-westward followed by the Royalists.
The respective forces were - Royalists about 18,000, Parliamentarians and Scots about 27,000.
On the other side the cavalry of the Eastern Association under Lieut.-General Cromwell and that of the Scots under Major-General Leslie (Lord Newark) formed the left, the infantry of the Eastern Association under Major-General Crawford, of the Scots under Lord Leven, and of the Yorkshire Parliamentarians under Lord Fairfax was in the centre and the Yorkshire cavalry under Sir Thomas Fairfax was on the right wing.
On the 1st of April 1643 the Parliamentarians under Sir John Seaton captured Wigan afte'- severe fighting.