17 janv. 1917 - U-boat
Description:
U-boat short for unterseeboot which means under see boat. they were used to blow up battle ships with out alerting the crew.
1.https://cdn.britannica.com/s:500x350/44/159744-004-D58C9A3A.jpg
2.https://cdn.britannica.com/s:300x300/11/60711-004-1DA5E38D.jpg
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