 Complete the following phrase:  The first siege of Dumbarton was lifted because of the assassination of Regent Moray in January 1570. The assassin James Hamilton of Bothwellhaugh  was welcomed at Dumbarton. Flemings defence of Dumbarton for Mary was satirized in a ballad printed by Robert Lekprevik in May 1570; The tressoun of Dumbertane. Attributed to Robert Sempill, the ballad describes Flemings failed ambush of Sir William Drury in May 1570. In October 1570 during the 