Caesar's cockiness had nearly ended in defeat, but the legions' experience combined with his personal role in combat turned a disaster into an incredible victory. The Belgae were broken, and most of the German tribes offered submission to Rome. The end of the campaigning season saw Caesar take care of tribes along the Atlantic coast, and deal with the Atuatuci, who were allies of the Nervii but had broken the terms of surrender. Caesar punished the Atuatuci by selling 53,000 of them into slavery. By law, the profits were Caesar's alone. He saw a minor setback towards winter as he sent one of his officers to the Great St Bernard Pass, where local tribes fought back fiercely; he abandoned the campaign. But overall, Caesar had seen monumental success in 57 BC. He had accumulated great wealth to pay off his debts and increased his stature to heroic levels. Upon his return, the senate granted him a 15-day thanksgiving ("supplicatio"), longer than any before. His political reputation was now formidable. Again, he returned to Transalpine Gaul for the winter to see to the civil affairs of the province. He wintered his troops in northern Gaul, where the tribes were forced to house and feed them.