In 1842, after his priesthood ordination in the
Cathedral of St. Louis in May 1842, Fr. Hoecken was sent to the
Potawatomi Mission on the
Osage River in
Kansas, led by Christian. In a letter to his parents (July 5, 1842) he asked them to send over 1000
dutch guilders to build a mill. In 1844 Hoecken was sent to the
Rocky Mountains and the
Oregon Country Mission that
Pierre-Jean De Smet started in 1840. Hoecken first worked among the
Kalispel in the Kalispel valley. Later he had missionary excursions to other Indian tribes in modern-day
Montana,
Washington and
Oregon. Most of his time was given to the tribes within or adjacent to what later was to become the
Flathead Reservation. Along with De Smet, Hoecken founded the
St. Ignatius Mission for the Flathead Indians, and moved with this mission to its present location in St. Ignatius, Montana, in 1854. Hoecken stayed attached to this mission until 1861 (the current church was built there between 1891 and 1893). During this time St. Ignatius was known to be the most "civilised and advanced" of all Indian missions. In 1859 Fr. Hoecken and Br. Vincent Magri set up
St. Peters Mission at
Priest Butte on the
Teton River, on a site just southeast of the current town of
Choteau, Montana. They built three log cabins, and were soon joined by father Camillus Imoda. However they had to abandon this site in 1860 and moved their mission to the
Sun River, about upriver from
Fort Shaw, near what is now
Simms, Montana. == Subsequent years ==