September 27 in Military History

The Continental Congress met for one day in Lancaster, Pennsylvania, after fleeing Philadelphia ahead of the British advance under General William Howe. The brief relocation reflected the precarious logistics of governing during active campaign operations and the Continental Army's failure to hold the capital city.

The Stockton and Darlington Railway in England began operations, becoming the world's first public railroad to use steam locomotives. The railroad revolution that followed transformed warfare by enabling rapid troop movements, supply logistics, and mobilization on a scale previously impossible, capabilities that would prove decisive in the American Civil War and both World Wars.

Canadian and British forces launched the Battle of the Canal du Nord, breaching a critical section of the Hindenburg Line. General Arthur Currie's Canadian Corps executed a complex crossing of the dry canal bed, then fanned out to overwhelm German defenses. The breakthrough was part of the Grand Offensive that was collapsing the German defensive system.

British forces under Major General Sir Charles Harington confronted Turkish nationalist troops at Chanak on the Dardanelles, the closest Britain and the new Turkish Republic came to open war. The resolution of the crisis without fighting demonstrated the limits of interwar British military posture east of Suez and influenced subsequent British Dominions policy.

Germany, Italy, and Japan signed the Tripartite Pact in Berlin, formally creating the Axis alliance. The pact aimed to deter the United States but ultimately ensured America would fight all three powers.

The Messerschmitt Me 262 Schwalbe (Swallow) made its first flight powered solely by jet engines. The world's first operational turbojet fighter, the Me 262 was 100 mph faster than any Allied fighter and could have altered the air war if deployed earlier and in greater numbers. Hitler's insistence on using it as a bomber wasted its potential.

The U.S. Army's 81st Infantry Division secured the island of Angaur in the Palau group after a week of fighting. Unlike nearby Peleliu, where Marines were still engaged in a brutal two-month battle, Angaur was taken relatively quickly and was immediately developed as an airbase supporting the Philippines campaign.

Representatives of eight nations signed the Southeast Asia Collective Defense Treaty in Manila, establishing SEATO as the Asian counterpart to NATO. The alliance shaped U.S. military planning in the region through the Vietnam War and justified subsequent deployments to Thailand, the Philippines, and Taiwan.

Taliban forces captured Kabul, completing their conquest of most of Afghanistan after more than four years of civil war. The regime's provision of sanctuary to Osama bin Laden and al-Qaeda would lead directly to the U.S. invasion of October 2001 and the twenty-year American military presence in Afghanistan.

The FBI publicly identified all nineteen September 11 hijackers and released their photographs. The investigation, the largest in FBI history, had traced the hijackers' movements through flight schools, financial transactions, and immigration records, building the evidentiary case that linked the attacks to al-Qaeda.