Dumont was introduced early to plains warfare when, aged 13, he took part at Grand Coteau in the defence of a Métis encampment against a large Sioux war party. Yet in 1862, with his father, he concluded a treaty between the Métis and the Sioux, and later one with the Blackfoot, that helped ensure pacification of the Canadian prairie. Dumont's skill as a buffalo hunter led to his election in the summer of 1863 when he was still 25 as permanent chief of the Métis hunters on the Saskatchewan. Until the virtual elimination of the buffalo, he led the Métis on the hunt; the last time was in 1881.

Dumont took no direct part in the Red River rising of 1870, though he made an offer - rejected by Louis RIEL - to bring Métis to resist WOLSELEY's expeditionary force. He recognized that great changes were coming to the prairie with the decline of the buffalo and spread of Canadian influence.

In 1873 he became president of the commune of St Laurent, the first local government between Manitoba and the Rockies. Modelled on the organization of the buffalo hunt, the commune tried to establish a system of landholding, since Dumont recognized that when hunting ended, his people would have to turn to farming. In 1875 the commune confronted the newly arrived North-West Mounted Police and the attempt at local government ended; concern over land did not, however, for government surveyors and land speculators began to flood the West and Dumont led the Métis in agitating for recognition of their rights.

When the campaign made no progress, Dumont was one of the delegates who sought Louis Riel's assistance. Negotiations with the government foundered, and when Riel declared a provisional government at Batoche, Dumont became "adjutant general" in charge of the tiny Métis army of 300 men formed at the beginning of the rebellion. During the subsequent NORTH-WEST REBELLION, he was a remarkable guerrilla leader. He won the first battle against the NWMP at DUCK LAKE in March 1885; he halted General MIDDLETON'S army at Fish Creek on Apr 24.

But Riel did not allow Dumont to continue his successful guerrilla campaign, and Batoche was besieged and captured, despite the resistance Dumont organized on May 12. Hearing Riel had surrendered, Dumont fled to the US. He plotted to rescue Riel, but the latter was too carefully guarded; following Riel's execution Dumont joined Buffalo Bill's Wild West Show as a crack marksman.

After the amnesty for rebels, he returned to Canada in 1888 and to Batoche in 1893. He hunted and traded a little, and dictated 2 vivid oral memoirs of the rebellion. He died suddenly of heart failure in 1906. Gabriel Dumont was a man of great chivalry, superbly adapted to the presettlement prairie life; in the world that followed, his skills lost their relevance, and so his qualities of intelligence and personality were ultimately wasted.