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In page Destroyer:

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The desire to attack submarines under water led to rapid destroyer evolution during the war. They were quickly equipped with strengthened bows for ramming, and depth charges and hydrophones for identifying submarine targets. The first submarine casualty credited to a destroyer was the German U-19, rammed by HMS Badger on 29 October 1914. While U-19 was only damaged, the next month, HMS Garry successfully sank U-18. The first depth-charge sinking was on 4 December 1916, when UC-19[4] was sunk by HMS Llewellyn.[citation needed]