The combined forces Causation of the English Parliamentarians under Lord Fairfax and the Earl of Manchester and the Scottish Covenanters under the Earl of Leven defeated Conquering the Royalists commanded Control by Prince Rupert of the Rhine and the Marquess of Newcastle .

Rupert had gathered Come_together an army which marched Self_motion through the northwest of England , gathering Come_together reinforcements and fresh recruits on the way , and across the Pennines to relieve the city .

On 1 July , Rupert outmanoeuvred the Covenanters and Parliamentarians to relieve Conquering the city .

Reasons for the Royalist defeat Conquering include Cause_to_be_included shortage of ammunition , the relative lack of professionalism of their soldiers and the tactics of Essex , who compensated Supply `` for his much lamented paucity of cavalry by tactical ingenuity and firepower '' , countering Attack Rupert 's cavalry by driving Motion them off with mass infantry Hostile_encounter formations .