HMS Activity was an escort carrier that served with the Royal Navy of the United Kingdom during the Second World War. After the war, she was sold into merchant service as the MV Breconshire, serving for over 20 years until scrapped in 1967.

Convoy JW 58 was an Arctic convoy sent from Great Britain by the Western Allies to aid the Soviet Union during World War II. It sailed in March 1944, reaching the Soviet northern ports in early April. All ships arrived safely. JW 58 was attacked by German U-boat and aircraft but suffered no losses. Three U-boats were destroyed and six aircraft were shot down during these operations.