Below are possible answers for the crossword clue Costly W.W. I battlegroun.
5 letter answer(s) to costly w.w. i battlegroun
YPRES
battle in World War I (1914); heavy but indecisive fighting as the Allies and the Germans both tried to break through the lines of the others
battle in World War I (1915); Germans wanted to try chlorine (a toxic yellow gas) as a weapon and succeeded in taking considerable territory from the Allied salient
battle in World War I (1917); an Allied offensive which eventually failed because tanks bogged down in the waterlogged soil of Flanders; Germans introduced mustard gas which interfered with the Allied artillery
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