Schiner feared French supremacy enough to place the military force of the diocese at the disposal of the pope and in 1510 brought about an alliance for five years between the Swiss Confederacy and the Roman Church, only to end up as one of the biggest losers in the Swiss defeat at Marignano in 1515, in which the bishop fought himself. In return for his support, Julius II made Schiner a cardinal and in 1513 accepted direct control of the see, which gave the Bishops of Sion much of the authority of an archbishop. The defeat at Marignano and the arbitrary rule of his brothers led to a revolt of Schiner's subjects; in 1518 he was obliged to flee the diocese.