Six months after Charles I was executed on 30 January 1649, Derby received a summons from General Ireton to surrender the island, but declined to do so. In August 1651, he and 300 Manxmen landed in Lancashire to take part in the Third English Civil War; defeated at Wigan Lane on 25 August 1651, Derby escaped with only 30 troops to join Charles II. Captured after the Battle of Worcester in September, he was imprisoned in Chester Castle, tried by court-martial and executed at Bolton on 15 October.
six months after charles i was executed on 30 january 1649 derby received a summons from general ireton to surrender the island but declined to do so in august 1651 he and 300 manxmen landed in lancashire to take part in the third english civil war; defeated at wigan lane on 25 august 1651 derby escaped with only 30 troops to join charles ii captured after the battle of worcester in september he was imprisoned in chester castle tried by court-martial and executed at bolton on 15 october