A year or two after the Congress of Berlin, the Kolašin brigade of Montenegro's people's army was formed. During the World War I, by the end of 1915 and in the beginning of 1916, it played a major part under the command of Serdar Janko Vukotić as part of the Sandžak army. In the famous Battle of Mojkovac, it successfully defended the "gates of Mojkovac" having repelled all the attack by much more numerous soldiers of the Austro-Hungarian army.