Cromwell attempted to bring the Scots to battle at Edinburgh. He advanced on Leslie's lines on 29 July, capturing Arthur's Seat and bombarding Leith from Salisbury Crags. Cromwell was not able to draw Leslie out, and the English retired for the night to their camp at Musselburgh; their rest was disturbed by a night raid by a party of Scottish cavalry. Cromwell's attack coincided with a visit by Charles II to the Scottish army, where he was warmly received. Members of the Covenanter government, concerned that their Godly war would be corrupted by feelings of personal loyalty to the King, asked Charles II to leave. They then ordered a new purge, which was quickly enacted in early August, removing 80 officers and 4,000 of Leslie's men, damaging morale as well as weakening the army's strength.