 In 1661 Druillettes joined Father Claude Dablon on an expedition overland to Hudson Bay, the purpose of which was to establish missions among the Native Americans in that region and perhaps to discover an outlet through Hudson Bay to China.They paddled up the Saguenay, reached Lake St. John and continued their course up a tributary, which they called the River of the Blessed Sacrament, finally coming to Kekouba, which was twenty-nine days from Tadousac.As the Indians refused to go any farther north and the country offered no prospect of a mission the travelers returned to Quebec.