German troops inflicted heavy losses on the Russians and forced them to retreat in this Eastern Front battle.

Battle of Tannenberg

First Battle of Masurian
Lake

Brusilov Offensive

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.