"Grinder" was armed with one 24-pounder gun and one 24-pounder carronade. Each mounted a 24-pounder carronade on the roof to support the battery. A carronade is a short, smoothbore, cast-iron cannon which was used by the Royal Navy. Lockyer's men sailed in 42 longboats, each armed with a small carronade. She was named after the carronade, a type of short barrelled cannon. A carronade, a ship cannon, was purchased by the legion in Nauvoo. Carronade was re-commissioned as IFS-1 on 2 October 1965. The last known use of a carronade in conflict was during the First Boer War. The carronade had been developed in the 1770s. In each, it was possible to mount 1 carronade. USS "Carronade" (IFS-1/LFR-1) was a ship of the United States Navy first commissioned in 1955. The more important types included the Demi-cannon, the Culverin and Demi-culverin, and the Carronade. Another four were cancelled on 23 December 1945 - "Carronade", "Culverin", "Cutlass" and "Rifle". From 1778, however, the most important exception was the carronade. As a result, the carronade had an unusually high centre of gravity.