Turreau's division advanced northeast up the Rhône valley, driving elements of Strauch's brigade before it. Turreau met Gudin's troops at the southern outlet of Grimsel Pass. Caught between the two French forces, Strauch's survivors retreated into Italy via the Nufenen Pass. Turreau then took control of the Grimsel Pass. Historian Ramsay Weston Phipps noted that Turreau is often confused with Tharreau in the histories. In fact, command of the Valais Division passed from Charles Antoine Xaintrailles to Tharreau and then to Turreau. In August 1799, Turreau cleared the Austrians from the Simplon Pass. He then defeated the Austrians in the Battle of Oberwald on 13-14 August, inflicting 3,000 casualties on his foes. In September, the Valais Division had two brigades under Jean-Baptiste Jacopin and Henri-Antoine Jardon and included the 28th, 83rd, 89th, and 101st Line Infantry Demi-brigades, the 1st, 4th, and 5th Swiss Battalions, and the 23rd Horse Chasseur Regiment.