||Officially designated the Sopwith Type 9400, the 1 ? Strutter was a two-seater biplane designed for reconnaissance and bombing missions. A single-seat dedicated bomber version was also developed. The Strutter's unofficial name was derived from the half-length struts that joined the aircraft's fuselage and its upper wing. It was the first British aircraft to employ a forward-firing machine gun, able to fire "through" the propeller, thanks to the installation of an interrupter gear, which prevented the gun from firing when the propeller blade was in the way. The Strutter operated with both the Royal Flying Corps and the Royal Naval Air Service over the Western Front in 1916, but it was slow and not particularly maneuverable, and so began to be replaced in frontline service in July 1917. Later in the war, the Strutter was also widely employed from the first aircraft carriers. In the Australian Flying Corps, it saw service as a trainer.