He was a member of the provisional government established by Louis Riel and captured Major Charles Arkoll Boulton, Thomas Scott and others when they attempted to take over Upper Fort Garry (now Winnipeg).
He left Riel's government after Boulton was sentenced to be executed.
In 1870, he was named a justice of the peace.
In 1871, he was part of a group of volunteers organized to defend Manitoba against the Fenian raids.
Delorme promoted Louis Riel as a candidate for Provencher in 1872, when Riel stepped aside for Sir George-Étienne Cartier, and 1873.
He was named hay commissioner in 1873 and served on the Council of the North-West Territories from 1873 to 1875.
He was named minister of agriculture and president of the executive council for Manitoba in 1878.