During the Second World War Stonecrop was a convoy escort and helped to sink two U-boats.

On 2 April 1943 she and the sloop Black Swan sank U-124 with depth charges off the coast of Portugal.

Both ships were escorting Convoy OS 45, from Liverpool to Freetown.

[1] Later that year on 30 August 1943 she and the sloop Stork sank U-634 with depth charges in the North Atlantic east of the Azores.

Following the war she was sold on 17 May 1947 and became the merchant ship Silver King.