The Battle of Polygon Wood took place from 26 September to 3 October 1917, during the second phase of the Third Battle of Ypres in the First World War. The battle was fought near Ypres in Belgium, in the area from the Menin road to Polygon Wood and thence north, to the area beyond St Julien. Much of the woodland had been destroyed by the huge quantity of shellfire from both sides since 16 July and the area had changed hands several times.