- Due to a lack of resources, Joffre cancels an attack planned in the Vosges, originally intended as a preliminary diversionary operation prior to the main offensive against the St.-Mihiel salient.
- Today the French 152nd Infantry Regiment, alongside 1st Chasseur Brigade, succeed in wresting control of the summit of Hartmannswillerkopf from the Germans.
- Admiral Robeck sends a further telegram to the Admiralty today, providing a more detailed justification of his decision to abandon the naval assault on the Dardanelles:
I do not hold the check on the 18th to be decisive, but having met General Hamilton . . . I consider a combined operation essential to obtain great results and object of campaign . . . To attack the Narrows now with fleet would be a mistake, as it would jeopardize the execution of a better and bigger scheme.