During the Marian civil war which followed the forced abdication of Mary, Queen of Scots in 1567, the garrison of Blackness remained loyal to her. However, the Keeper, Alexander Stewart, later changed sides to join the Regent Moray's party. In 1572, Lord Claud Hamilton recaptured the castle for Mary, harrying shipping in the Forth until the following year, despite being blockaded. On 27 January 1573, James Kirkcaldy, the brother of William Kirkcaldy of Grange who held Edinburgh Castle for Queen Mary, arrived at Blackness from France with arms and money for the Queen's side. His ship was captured the next day and Regent Morton laid siege. James Kirkcaldy and the castle surrendered within a week.