Scene of costly Allied campaign in 1915 (9)

I believe the answer is:

gallipoli

(Other definitions for gallipoli that I've seen before include "World War I battle of the Dardanelles" , "Turkish site of WW1 campaign" , "old war-zone" , "military campaign" , "Scene of WW2 landing in 1915" .)

I've seen this clue in The Times.

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