Operation Compass. Monitor HMS Terror bombards Bardia, keeping up pressure on the 40,000 beseiged Italian troops.
Luftwaffe bombing badly damages 2 destroyers under construction at Southampton (to be called Norseman and Opportune). Norseman is almost blown in half but will be repaired and commissioned into the Royal Australian Navy as HMAS Nepal on May 29 1942 (launched May 29 1942).
Destroyer HMS Valorous collides with minesweeping trawler HMT Libyan in Sheerness Harbour in the Thames Estuary. HMS Valorous will be repaired at Chatham until January 11 1941.