The completeness of Francis's success, and his efforts to rouse the Scots against England drove Henry VIII. into the arms of Ferdinand. (October 19.) English gold was liberally expended among the Confederates; and in February, 1516, 17,000 Swiss mercenaries moved on Verona, to join the Imperialists. Maximilian, whose forces were further swelled by levies of Tyrol and the Swabian League, was thus enabled to take the offensive in North Italy, with better prospects of success than on any previous occasion. In March he led a well-appointed army of 30,000 men across the Mincio, and forced the French and Venetians to raise the siege of Brescia and fall back upon their respective bases. Maximilian continued to advance rapidly beyond the Oglio and the Adda, until he was within nine miles of Milan itself. But now, when Bourbon was well-nigh incapable of any prolonged resistance, and when fortune, after so many rebuffs, seemed at length about to crown the Imperial arms with victory, Maximilian, for some inexplicable reason, hesitated to strike home, and withdrew his army once more behind the Adda. His motives for so extraordinary a step have never been discovered; and today we are as completely in the dark as were his own allies at the time. Pace, who, as English envoy in Maximilian's camp, had peculiar opportunities for clearing up the mystery, writes in { 71} his report to Wolsey, "that no man could, ne can, conject what thing moved him to be so slack at that time, when every man did see the victory in his hands, and the expulsion of the Frenchmen out of Italy."[88] Maximilian's own version--that the difficulties of foraging, the enemy's superiority in cavalry, and the stoppage of English money necessitated a retreat--is, in the face of incontestable facts, most improbable; and the only plausible suggestion--that the Emperor's change of policy was produced by a liberal outlay of French gold--is pure conjecture, unsupported by proofs. If we may believe the testimony of Pace in a matter which concerned his own person (and there is no reason to suspect his honesty), the Emperor, in his straits for money, actually profited by the English envoy's helpless condition, to extort a large sum of money from him, declaring that in case of a refusal he would make terms with France and would inform Henry that Pace had been responsible for his defection.[89]