Ordered during World War II, she saw service instead with the Royal Canadian Navy in the Battle of the Atlantic.

[2][3] After commissioning Loch Morlich joined convoy escort group EG 6 based in Derry after working up at Tobermory.

She patrolled the waters around the United Kingdom until April 1945 when the group was transferred across the Atlantic to Halifax.

She was decommissioned and returned to the United Kingdom 20 June 1945 at Sheerness alongside HMCS Loch Achanalt, another Loch-class loaner to the Royal Canadian Navy.

[1] In 1950, along with HMNZS Pukaki, she sailed for Korea, taking part in the United Nations naval blockade during the Korean War, serving mainly as an escort.