 Complete the following phrase:  When WWI broke out, Hindenburg was retired in Hanover. On 22 August, he was selected by the War Cabinet and the German high command Oberste Heeresleitung, OHL to assume command of the German Eighth Army in East Prussia, with General Erich Ludendorff as his chief of staff. After the Eighth Army had been defeated by the Russian 1st Army at 