On November 30, 1939, after Soviet demands made to Finland went unmet -- they were asking the Finns to give them land concessions and to destroy fortifications along the border -- the USSR invaded Finland. Some 450,000 Soviet soldiers crossed the border, starting a brutal, frozen battle that would be called the Winter War. In this image, a member of a Finnish anti-aircraft detachment, wearing his white camouflage uniform, works with a range-finder on December 28, 1939, during a Russian aerial attack. (AP Photo) #