Operation Compass. At noon, after crossing 150 miles of desert in 30 hours, Combe Force’s armoured cars cut the coast road at the hamlet of Sidi Saleh. 30 minutes later, retreating Italians begin arriving from Benghazi but they cannot break through the British roadblock. By evening, 4th Armoured Brigade reaches the road 10 miles North at Beda Fomm and attacks the Italian column with tanks.
Battle of Keren, Eritrea, East Africa. British and Indian troops launch an attack through the hills on the left side of Dongolaas Gorge on the approach to Keren. 2nd Queen's Own Cameron Highlanders fight to the top of 1616 meter high ridge, which will become known as Cameron Ridge. Although fighting in the Gorge will swing back and forth for almost 2 months, Allied forces will not relinquish Cameron Ridge.
British anti-submarine trawler HMT Tourmaline is bombed and sunk by German aircraft off North Foreland, Kent.
British submarine HMS Sealion sinks Norwegian SS Ryfylke 2 miles off the Norwegian coast near Stadlandet.