The Brusilov Offensive began when the Russian Army ran low on ammunition and General Brusilov developed a new set of tactics that came to be called "shock tactics".
Brusilov used smaller specialized units of soldiers to attack weak points in the German trench lines and blow open holes for the rest of the Russian Army to advance into.
Shock tactics were a remarkable departure from the "human wave" tactics that were prevalent during World War One.
Shock tactics would later play a large role in the early German blitzkrieg offenses during World War Two.