A barge transporting guns to the beaches and also capable of defending beaches from the sea at a distance of 3,000 to 5,000 yards (2750 to 4500 m). LBFs were 60 to 90 feet long (approximately 18 to 27 m). They were equipped with two 40 mm Bofors guns and either two 20 mm Hispano guns or two twin Lewis machine guns.

Find out more : note on ONI 226