September 5 in Military History

Fifty-six delegates from twelve of the thirteen American colonies gathered at Carpenters' Hall in Philadelphia for the First Continental Congress. Called in response to the Intolerable Acts, the Congress organized colonial resistance to British policies and established the Continental Association to enforce a trade boycott. The Congress laid the political foundation for the armed resistance that would erupt at Lexington and Concord seven months later.

A French fleet of 24 ships of the line under Rear Admiral Comte de Grasse defeated a British fleet of 19 ships under Rear Admiral Thomas Graves off the Virginia Capes, sealing the fate of Cornwallis's army at Yorktown.

The Oglala Lakota war leader Crazy Horse was fatally bayoneted by a soldier of the 14th Infantry at Camp Robinson, Nebraska Territory, after resisting arrest and confinement in the guardhouse. Crazy Horse had surrendered four months earlier, one of the last major Lakota war leaders to come in from the Powder River country. His death effectively ended organized Lakota resistance on the northern plains.

Russia and Japan signed the Treaty of Portsmouth in New Hampshire, ending 19 months of warfare that had shattered Russian military prestige and announced Japan as a great power. The treaty, mediated by President Theodore Roosevelt, gave Japan control of Korea, the southern half of Sakhalin Island, and a lease on the Liaodong Peninsula. The war had demonstrated the decisive value of naval modernization, machine guns, and trench systems.

French and British forces launched a desperate counterattack against the German armies advancing on Paris, beginning the First Battle of the Marne. General Joseph Gallieni famously requisitioned 600 Parisian taxicabs to rush reinforcements to the front. Over four days of ferocious fighting, the Allies halted the German advance and shattered the Schlieffen Plan, saving Paris and ensuring the war would not end in a quick German victory.

President Roosevelt officially declared American neutrality in the European war following the German invasion of Poland and the British and French declarations of war. However, in a fireside chat the following day, Roosevelt acknowledged that "even a neutral cannot be asked to close his mind or his conscience," signaling the administration's sympathy for the Allies and foreshadowing the eventual shift to active support.

The 503rd Parachute Infantry Regiment conducted the first Allied airborne operation in the Pacific theater, parachuting onto the Nadzab airfield in the Markham Valley of New Guinea. General MacArthur personally observed the drop from a B-17. The successful seizure of the airfield allowed Australian troops to be flown in and advance on the Japanese base at Lae.

The Soviet Union declared war on the Kingdom of Bulgaria after years of an anomalous situation in which Bulgaria had been allied with Nazi Germany while maintaining diplomatic relations with the USSR. Red Army units crossed the Romanian border into Bulgaria within days, meeting no resistance. A communist-led coup on September 9 installed the Fatherland Front government, which declared war on Germany and committed Bulgarian forces against the Wehrmacht in Yugoslavia.

Igor Gouzenko, a cipher clerk at the Soviet embassy in Ottawa, defected with 109 classified documents proving that the USSR had run an extensive espionage network against the Manhattan Project and Allied military technology programs. The Canadian government detained him after days of initial dismissal by the RCMP. The documents exposed the atomic spy ring and are widely credited with launching the Cold War intelligence confrontation.

Eight members of the Palestinian militant group Black September took eleven Israeli Olympic team members hostage at the Munich Olympic Village. A botched rescue attempt at Fürstenfeldbruck airfield resulted in the deaths of all eleven hostages, five terrorists, and one German police officer. The massacre led to Israel's covert Operation Wrath of God retaliation campaign and transformed international counterterrorism doctrine.