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January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
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| Jan. 19-20 | First German Zeppelin attack on England |
| Feb. 4 | German U-Boats attack enemy and neutral ships |
| Second Battle of Masurian Lakes (Winter Battle) | |
| Feb.-April | Austria-Hungary attacks Galicia |
| Feb. 19- Aug. | Allies attack Dardanelles and Gallipoli |
| April- June | German focuses attacks on Eastern Front |
| April 22- May 25 | Second Battle of Ypres |
| First use of poison gas | |
| April 26 | France, Italy, Russia, and Britain form secret Treaty of London |
| May 9 | Second Battle of Artois |
| May 23 | Italy declares war on Austria-Hungary |
| June 29- Dec. 2 | Italians unsuccessful in the 12 Battles of Isonzo |
| Aug. 4 | Germans capture Warsaw |
| Sept. 5 | Tsar Nicholas commands Russia's military |
| Sept. 22 | Second battle of Champagne |
| Oct.- Nov. | Austro-German-Bulgarian forces takeover Serbia |