主教戦争
Leslie petitioned to leave Swedish service in August 1640 after being wounded in battle. The Swedish Riksråd (Royal Council) records show that he and Colonel James Lumsden asked to return to Scotland at the same time. The seriousness of Leslie's wounds is questionable and it is likely that they were summoned home to support Alexander Leslie's Army of the Covenant, then participating in the Bishops' Wars against Charles I. Both these officers were rewarded with a severance deal which included 200 muskets and 200 suits of armour each. Leslie also received a valuable gold chain as an indication of his loyal service to the Swedish Crown. The Stuart ambassador in Hamburg, Sir Thomas Roe, informed London of Leslie's departure with Colonel Lumsden and 24 other Scottish officers from that city. They arrived in Scotland after the Bishops' Wars had effectively ended.