- Oct 1 The first division of Canadian troops, 33,000 sail for Britain; most Canadians are volunteers, anxious to prove their loyalty to the Commonwealth
- Oct 1 The Prince of Asir, the southern region of Arabia, rises in revolt against the Turks; his actions will inspire other Arab leaders to revolt
- Oct 4 Dardanelles: French & British fleet bombards Turkish forts
- Oct 5 World War I first aerial combat resulting in a kill
- Oct 6 The Russians fall back along the Eastern Front in Poland and Galicia
- Oct 9 German troops take Antwerp in World War I
- Oct 10 German forces rout Belgians in Antwerp, Belgium (WWI)
- Oct 11 German troops occupy Ghent
- Oct 12 The First Battle of Ypres begins
- Oct 13 American inventor Garrett Morgan patents his safety hood device, which would later be refined into the gas mask [1]
- Oct 13 Baseball World Series: Boston Braves beat Philadelphia A's, 3-1 at Fenway Park for first 4-game sweep in WS history; 'Miracle Braves' last in NL July 4
- Oct 13 Pro-German Boers begin opposition to British authority in South Africa
- Oct 13 The Belgian government in exile installed at St Adresse at Le Havre
- Oct 14 German troops occupy Brug
- Oct 15 Battle of Warsaw, begins (ends Oct 21)
- Oct 15 US Clayton Anti-trust Act passed (union & strike rights)
- Oct 18 Schoenstatt Movement is founded in Germany
- Oct 21 Battle of Warsaw ends with German defeat
- Oct 27 British battleship Audacious sunk by mine
- Oct 28 German battle cruiser Goeben enters Black Sea
- Oct 28 Omega Psi Phi Fraternity, founded at Howard University, incorporates
- Oct 29 Turkish warships storm Black Sea
- Oct 30 Allied offensive at Ypres (Belgium), aka 'Wipers' during WWI begins
- Oct 31 Great Britain & France declare war on Turkey
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists