August 13th, 1915

- President Poincaré, Premier Viviani, and Minister of War Millerand visit Joffre at the latter's headquarters, where they press Joffre to transfer four divisions to General Sarrail's new Army of the Near East.  The French commander-in-chief refuses, saying that nothing can be spared until the completion of the upcoming autumn offensive, and opposes making military decisions to please whom he refers to as 'a factious general.'

- In central Poland, while the German 9th Army crosses the Liwiec River, the units under Woyrsch's command is forced to launch a determined attack on the Russian positions to the east of Lukow, in order to dislodge the enemy and resume the advance.  Though the Russians are pushed back, they are able to retain cohesion and establish a new defensive position on the line Misie-Hadynow.  To the south, the Austro-Hungarian 4th Army finds itself now advancing almost due east as the Russian salient collapses, and like its German counterparts to the east finds itself being squeezed; today XIV Corps is pulled from the line.

- The German submarine UB14, patrolling the route between Alexandria and the Dardanelles, torpedoes the British transport Royal Edward, which sinks with the loss of nine hundred lives.