The BL 5.5-inch Gun is a British artillery piece developed in the early 20th century. It was primarily used during World War II and is known for its versatility and effectiveness in both field and coastal defense roles. The gun has a caliber of 140 mm and was designed to fire high-explosive shells, providing significant firepower for ground forces. This artillery piece was mounted on various platforms, including towed and self-propelled versions. The BL 5.5-inch Gun played a crucial role in several military campaigns, contributing to the success of the British Army and its allies during the war.