During the First World War, many combatants faced the deadlock of trench warfare. On the Western Front in 1915, the Germans formed a specialized unit called the Rohr Battalion to develop assault tactics. During the Brusilov Offensive of 1916, the Russian general Aleksei Brusilov developed and implemented the idea of shock troops to attack weak points along the Austrian lines to effect a breakthrough, which the main Russian Army could then exploit. The Russian Army had also formed hunter commando units in 1886, and used them in World War I to protect against ambushes, to perform reconnaissance and for low-intensity fights in no-man's-land.