"The barrel of a 9.2-inch howitzer of No. 2 Super Heavy Battery, Royal Artillery, on a railway flatcar at Dunkirk, having been transported from England on a cross-channel ferry, 20 March 1940." The barrel of a 9.2-inch howitzer of No. 2 Super Heavy Battery, Royal Artillery, on a railway flatcar at Dunkirk, having been transported from England on a cross-channel ferry, 20 March 1940.