Castle-class corvettes paired long range with Squid

At just over one thousand tons, the Castle class was only modestly larger than a Flower but offered exceptional range at economical speed. About 9,500 miles at ten knots suited the single-screw escort to oceanic work. Its equipment included a general-purpose 4-inch gun, a Squid anti-submarine mortar, depth charges, a substantial 20 mm battery, and nearly a destroyer's sensor suite. Amberley Castle's recorded movements between British ports, Gibraltar, and Atlantic convoys put those specifications into an operational setting. The reference gives an impossible sequence, with the ship ordered in 1944 and laid down in 1943, which is probably a book error. Her voyage record shows how these corvettes circulated through the convoy system, while the date problem warns against accepting detailed ship histories uncritically.