August 17 - Russia Invades Prussia

The Russians invade East Prussia, thereby creating an "Eastern Front" in Europe. The Russian offensive begins with the Battle of Stalluponen.

The Russian invasion of Prussia

Russian cavalrymen form the spearhead of the Russian advance into Prussia

The Belgian Government moves to Antwerp from Brussels.

In the English Channel, Edward Croft and the 26th Brigade RFA on board the SS Cardiganshire remain offshore outside Boulogne from 5am to 5pm. They do not disembark until 6pm.