Operation Compass. Australian 6th Division enters the town of Derna unopposed.
At 3.10 AM, U-94 concludes the attack on convoy SC-19 sinking British SS Rushpool (all 40 crew picked up by destroyer HMS Antelope). 6 ships (total of 33,723 tons) have been sunk in less than 24 hours.
30 miles North of Zavia, Libya, British submarine HMS Upholder unsuccessfully attacks Italian steamers Motia & Delfin and is counter-attacked by convoy escort torpedo boat Aldebaran.