, preparing for the Invasion of Normandy, 1944 Mk I, of built-up
wire-wound construction with a propellant charge in a cloth bag, went into service beginning in 1918 on destroyers of the new
Admiralty type destroyer leader (
Scott class) and
Thornycroft type leader (
Shakespeare class). Some saw service in
World War I, but most entered service after the war ended. It was also mounted on : • s as re-gunned in 1918 •
Thornycroft and Admiralty Modified W-class destroyers completed 1919–1920 • Prototype destroyers and commissioned in 1926 and 1927 Mk II was a monobloc-barrel (i.e. single-piece, typical of small to medium World War II guns) gun of similar performance introduced in
World War II to replace the worn-out Mk I guns on surviving ships. These were the only
BL-type 4.7-inch guns in British service; all others have been of the
QF-type. They were superseded on new destroyers from 1930 by the
QF 4.7-inch Mk IX. == Ammunition ==