Lee-Barber was promoted to Commander in June 1941 and participated in the Greece Campaign. He participated in the evacuation of British troops from both Greece and the Crete, which his skill and persistence earning a second DSO. HMS "Griffin" also received a message of congratulations from commander of the Mediterranean Fleet, Admiral Andrew Cunningham. "Griffin" went on to bombard Vichy French positions at Haifa and Sidon. The ship also acted in support of the garrison during the Siege of Tobruk. Lee-Barber would take supplies in to the troops, running the gauntlet of U-boats and having to unload all supplies in 40 minutes. This timeframe allowed the ship to get back under the protective Royal Air Force (RAF) air umbrella by dawn. After this busy service Lee-Barber was posted to a land based job in army liaison in the Home Counties in late 1941.