Hundred Days Offensive

For the final period of Napoleon's rule that coincided with the War of the Seventh Coalition, see Hundred Days.

Hundred Days Offensive
Part of the Western Front of World War I
Allied gains in late 1918
Date 8 August – 11 November 1918 (95 days) Location Amiens, France to Mons, Belgium Result Allied victory
Belligerents
France British Empire United Kingdom Canada Australia New Zealand Newfoundland South Africa United States Belgium Italy Portugal Siam	German Empire Austria-Hungary
Commanders and leaders
Ferdinand Foch Philippe Pétain Paul Maistre Émile Fayolle Noël Castelnau Douglas Haig Henry Wilson John J. Pershing King Albert I Jean Degoutte	Paul von Hindenburg Erich Ludendorff Wilhelm Groener Max von Gallwitz Prince Rupprecht Wilhelm of Prussia Max von Boehn Duke Albrecht
Strength
Strength on 11 November 1918: c. 2,559,000 c. 1,900,000 c. 1,900,000 c. 190,000	Strength on 11 November 1918: c. 3,562,000
Casualties and losses
18 July – 11 November: 1,070,000 531,000 412,000 127,000	18 July – 11 November: 1,172,075+ 100,000+ killed 685,733 wounded 386,342 captured 6,700 artillery pieces Breakdown Men and material captured, by country BEF: 188,700 prisoners, 2,840 guns French: 139,000 prisoners, 1,880 guns US: 44,142 prisoners, 1,481 guns Belgian: 14,500 prisoners, 414 guns 17,500 2,500 killed 5,000 captured 10,000 wounded

The Hundred Days Offensive (8 August to 11 November 1918) was a series of massive Allied offensives that ended the First World War. Beginning with the Battle of Amiens (8–12 August) on the Western Front, the Allies pushed the Imperial German Army back, undoing its gains from the German spring offensive (21 March – 18 July).

The Germans retreated to the Hindenburg Line, but the Allies broke through the line with a series of victories, starting with the Battle of St Quentin Canal on 29 September. The offensive led directly to the Armistice of 11 November 1918 which ended the war with an Allied victory.

The term "Hundred Days Offensive" does not refer to a planned Allied campaign, but rather the rapid series of Allied victories. The offensive actually took 95 days.