He was to replace Father Jean-Pierre Aulneau who had lost his life in the massacre on Lake of the Woods in 1736.
They left for the west in June, 1741 and Coquart was left at either Fort Michilimackinac or Fort Kaministiquia because of the riskiness of starting a new mission further west.
We do know that he was aware of, and wrote about La Colle's raid on the Sioux of the Prairies in 1741.