| Dates | Events | |
| September 18 – October 17 |
Battle of the Hindenburg Line, a phase of the Hundred Days Offensive. The Allies break through the German lines. |
Details |
| September 26 – November 11 |
Meuse-Argonne Offensive, the final phase of the Hundred Days Offensive and of World War I. |
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| September 26 – October 1 |
The British enter Damascus. |
Details |
| September 27 – October 1 |
Battle of the Canal du Nord, a phase of the Battle of the Hindenburg Line. |
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| September 28 – October 2 |
Fifth Battle of Ypres (also known as Advance on Flanders), a phase of the Battle of the Hindenburg Line. |
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| September 29 – October 10 |
Battle of St. Quentin Canal, a phase of the Hundred Days Offensive. |
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| September 30 |
Bulgaria signs an armistice with the Allies. |
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| Battle of Saint-Thierry (Initial phase of the Meuse-Argonne Offensive). |
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| Charge at Kaukab, a phase of the Capture of Damascus. |
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| Charge at Kiswe, a phase of the Capture of Damascus. |
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| October 3 |
Tsar Ferdinand I of Bulgaria abdicates and Boris III accedes to the throne. |
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| October 3–27 |
Pursuit to Haritan. |
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| Battle of Blanc Mont Ridge. |
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| October 8–10 |
Second Battle of Cambrai (also known as Battle of Cambrai (1918)), a phase of the Battle of the Hindenburg Line. |
Details |
| October 14–17 |
Battle of Montfaucon (intermediate phase of the Meuse-Argonne Offensive). |
Details |
| October 14–19 |
Battle of Courtrai, closing phase of the Hundred Days offensive. |
Details |
| October 15 |
Battle of Mont-D'Origny, a phase of the Hundred Days Offensive. |
Details |
| October 17–26 |
Battle of the Selle, closing phase of the Hundred Days Offensive. |
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| October 20 |
Germany suspends submarine warfare. |
Details |
| Battle of Lys and Escaut (Which included the Second Battle of Lys and the Battle of the Escaut), a phase of the Hundred Days Offensive. |
Details |
| Battle of Serre, a phase of the Hundred Days Offensive. |
Details |
| October 23–30 |
Battle of Sharqat. |
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| October 24 – November 4 |
Battle of Vittorio Veneto. The Austro-Hungarian army is routed. The Italians enter Trent and land at Triest. |
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| October 24–28 |
Second Battle of Monte Grappa, beginning phase of Vittorio Veneto. |
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| October 25 |
Battle of Aleppo. |
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| October 29 |
Wilhelm Groener replaces Erich Ludendorff as Hindenburg's deputy. |
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| Germany's Hochseeflotte mutinies. |
Details |
| State of Slovenes, Croats and Serbs proclaimed. |
Details |
| October 30 |
The Ottoman Empire signs the Armistice of Mudros. |
Details |
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