He was recalled to Europe in 1850, first in order to make his final year of formation (called 'Tertianship') in Drongen, Belgium and soon after (1851), in Germany, to be a member of the 'missionary band' led by Father Peter Roh.
After another year of formation (tertianship) in Brooklyn, Ohio, Father Büchel returned to the Lakota in August 1907, first as a teacher at Holy Rosary Mission School in Pine Ridge, and then in 1908 as its superior for eight years.