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| 1915 |
| Jan. 24 |
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| Naval action occurred off the Dogger Bank between the British and German battle-cruiser squadrons. Hipper, though outnumbered, did much damage to the British flagship and ultimately got away, losing only his poorest ship, the Blüer. | 1 |
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| March 28 |
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| A German submarine sank the first passenger ship. | 2 |
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| May 1 |
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| The first American ship (Gulflight) was sunk without warning. | 3 |
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| May 7 |
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| LUSITANIA SUNK off the coast of Ireland. Before the ship left New York, a warning against sailing on it had been inserted in the newspapers by the German embassy, but it is not true that a submarine was sent out specially to sink it. The captain failed to observe instructions to zigzag his course, and so came within range of the submarine. The Lusitania carried a part-cargo of small arms and munitions. | 4 |
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| Aug. 19 |
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| German submarine sank the Arabic. | 5 |
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