On 14 August 1793, the Duke of Montferrat's column passed over the Little St Bernard Pass and swept down into the Tarentaise Valley. Farther south, the Marquis of Cordon's column crossed the Mont-Cenis Pass and moved into the Maurienne Valley. The defending division of General of Brigade François Joseph Thorillon Dubourg had General of Brigade Charles Philippe Badelaune's (or Bagdelonne's) brigade in the Tarentaise and General of Brigade Jean-Denis Le Doyen's brigade in the Maurienne. Montferrat's force clashed with Badelaune at Séez on 15 August and Moûtiers on 18 August, routing the French both times. Bourg-Saint-Maurice and the entrenched camp at Saint-Martin-d'Arc both fell into Montferrat's hands. Both brigades were driven back into the lower valleys. Badelaune finally took up a strong position at Albertville and Le Doyen set up a roadblock at Aiguebelle. Farther north, another Piedmontese detachment violated Swiss neutrality by crossing the Great St Bernard Pass and moved into the Arve valley, capturing Sallanches and driving the French back to Carouge near Geneva. Dubourg reported to Kellermann that if he were pressed back any farther, he must abandon Chambéry and withdraw to Fort Barraux.