Russian troops assemble on a river bank during preparations for the Brusilov Offensive.
After continued setbacks through much of 1915 and early 1916, the Imperial Russian Army mustered as much strength as possible to put on a massive offensive in the summer of 1916, times to coincide with similar pushes by the western members of the Entente powers.
In the short term, the offensive was a major success, not only relieving pressure on the western combatants, but almost knocking Austria-Hungary out of the war due to their massive casualties. These paled in comparison to the losses Russia took to deal such a blow, and whatever their success, the spoils could have been much more, but the Russians were unable to capitalize on them due to mismanagement and poor logistics.
Many analysts after the war believed that is Russia had been able to better press the attack, Austria-Hungary could have been totally knocked out of the war, leaving Germany alone and perhaps willing to make peace. In the bigger scheme of things, the offensive did little more than waste over a million Russian soldiers for little long-term gain.