http://www.onwar.com/chrono/1941/dec41/f15dec41.htm
Red Army advancing before Moscow
Monday, December 15, 1941 www.onwar.com
On the Eastern Front... Soviet forces attacking northwest of Moscow reach Klin and Kalinin and retake both towns.
In the Mediterranean... U-557 sinks a cruiser off Alexandria. The British launch a convoy to bring supplies from Egypt to relieve Malta. Six cruisers and 16 destroyers set out from Malta (Force K) to meet the convoy from Alexandria under the command of Admiral Vian (Force B).
In North Africa... British attacks continue around Gazala as Rommel prepares to withdraw to El Agheila.
In Malaya... British forces retreat to Gurun and suffer heavy losses defending against the Japanese attack. Gurun however, holds.
In Hong Kong... Japanese attempt to land a small force from Kowloon on Hong Kong island, they are repelled.