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| 1915 |
| Feb. 16–March 30 |
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| After bombarding the German positions in Champagne, the French attacked but made no significant advances. | 1 |
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| March 10–13 |
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| British attacks near Neuve Chapelle succeeded in breaking through the German line for a short distance. | 2 |
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| April 22–May 25 |
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| Second Battle of Ypres. The original Allied plans for a major offensive were more or less frustrated by the use of gas (chlorine) by the Germans (April 22). Though the French had advance information of what was coming, they had made no preparation for it. The troops fled, leaving Ypres exposed. The Germans gained some ground at first, but were apparently themselves skeptical of the effect of the new weapon and were unprepared to take full advantage of the situation. | 3 |
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| May 9–June 18 |
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| Second Battle of Artois. After an unprecedented bombardment, the French (Gen. Henri-Philippe Pétain) succeeded in breaking through on a six-mile front north of Arras and facing Douai. | 4 |
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| Sept. 22–Nov. 6 |
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| Second Battle of Champagne. This was the key operation in Joffre's great offensive. The French attacked on a front between Rheims and the Argonne. The Germans, however, held their own on the heights between Rheims and St. Menehould, so that after many weeks of desperate fighting Joffre had little to show. | 5 |
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| Sept. 25–Oct. 15 |
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| Third Battle of Artois. This was the British contribution to the great offensive in Champagne. The British here first used gas. Greatly outnumbering the Germans, they succeeded in driving the enemy back toward Lens and Loos, but then failed to capitalize on this advantage. | 6 |
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