On December 11, 1777, General George Washington begins marching 12,000 soldiers of his Continental Army from Whitemarsh to Valley Forge, Pennsylvania, for the winter. As Washington’s men began crossing the Schuylkill River, they were surprised by a regiment of several thousand British troops led by General Charles Cornwallis. Cornwallis came across the continental forces by chance as he followed General William Howe’s orders to forage for supplies in the hills outside Philadelphia.

Adolf Hitler declares war on the United States, bringing America, which had been neutral, into the European conflict.

The ferry carrier, USNS Core, arrives in Saigon with the first U.S. helicopter unit. This contingent included 33 Vertol H-21C Shawnee helicopters and 400 air and ground crewmen to operate and maintain them. Their assignment was to airlift South Vietnamese Army troops into combat.

On December 11, kidnappers release Frank Sinatra, Jr., after abducting him in Lake Tahoe, California, three days earlier. The 19-year-old man, who was trying to follow in his father’s footsteps by pursuing a singing career, had been blindfolded and taken at gunpoint from his hotel room at Harrah’s Club Lodge and taken to Canoga Park, an area of Southern California’s San Fernando Valley. After allowing a brief phone conversation between father and son, the kidnappers demanded a ransom of $240,000.

The secretary of the Moscow writer’s union declares that nudity as displayed in the popular play Oh! Calcutta! is a sign of decadence in Western culture. More disturbing, he claimed, was the fact that this “bourgeois” thinking was infecting Russian youth.

On December 11, 1978 half a dozen masked robbers raided the Lufthansa Airlines cargo building at JFK Airport in New York, making off with more than $5 million in cash ($21 million in today's dollars) and almost $1 million in jewelry. To this day, the Lufthansa heist, as it is known, is considered one of the greatest in U.S. history.

In the largest Russian military offensive since the 1979 invasion of Afghanistan, thousands of troops and hundreds of tanks pour into the breakaway Russian republic of Chechnya. Encountering only light resistance, Russian forces had by evening pushed to the outskirts of the Chechen capital of Grozny, where several thousand Chechen volunteers vowed a bitter fight against the Russians.

On December 11, 2008, financier Bernard Madoff is arrested at his New York City apartment and charged with masterminding a long-running Ponzi scheme later estimated to involve around $65 billion, making it one of the biggest investment frauds in Wall Street history.