December 25 in Military History

Pope Leo III crowned Charlemagne as Emperor of the Romans at St. Peter's Basilica in Rome on Christmas Day, creating a military and political entity that would shape European warfare and statecraft for a thousand years.

General George Washington led the Continental Army across the icy Delaware River on Christmas night for a surprise attack on the Hessian garrison at Trenton, a victory that saved the American Revolution.

On Christmas night, General George Washington led 2,400 Continental Army soldiers across the ice-choked Delaware River at McConkey's Ferry, Pennsylvania, in preparation for the surprise attack on the Hessian garrison at Trenton, New Jersey, the following morning. The operation saved the Continental Army from collapse after a catastrophic autumn campaign and restored American morale at a critical moment.

British and German soldiers along the Western Front spontaneously ceased fire, sang carols across no man's land, exchanged gifts, and played football, one of the most remarkable episodes of humanity amid the industrialized slaughter of World War I.

A German Imperial Navy Zeppelin airship bombed the port of Cuxhaven and the Royal Navy seaplane carriers moored at Great Yarmouth in one of the first strategic bombing raids of the First World War. British seaplanes from HMS Engadine, HMS Riviera, and HMS Empress attempted a counter-strike against the Cuxhaven Zeppelin sheds the same day, pioneering the carrier-based air attack concept that would define naval aviation for the next century.

Hong Kong surrendered to the Japanese on "Black Christmas" after 18 days of fierce resistance, marking Britain's first colonial surrender to Japan and beginning three years and eight months of brutal occupation.

The besieged 101st Airborne Division held Bastogne against fierce German attacks on Christmas Day as Patton's Third Army fought to break through, one day before the relief that would turn the Battle of the Bulge.

Astronauts Frank Borman, Jim Lovell, and William Anders entered lunar orbit aboard Apollo 8, becoming the first humans to circle another world. During their ten orbits, they broadcast a Christmas Eve reading of Genesis from lunar orbit watched by an estimated one billion viewers worldwide, and Anders captured the Earthrise photograph that became one of the most reproduced images of the twentieth century.

Soviet President Mikhail Gorbachev resigned and the Soviet flag was lowered over the Kremlin for the last time, formally ending the Cold War and the superpower that had maintained the world's largest nuclear arsenal and conventional military force for seven decades.

Mikhail Gorbachev announced his resignation as President of the Soviet Union in a televised address from the Kremlin, and the Soviet flag was lowered over the Senate dome for the last time that evening. The dissolution concluded 74 years of Soviet state existence, ended the Cold War, and set in motion the strategic, military, and nuclear-security transformations that shaped the following three decades.