Two days later Middlemore, Cordier and Maund left Chamonix for Pontresina in the Bernina Range. Maund, suffering from poisoning having drunk from a can with a soldered brass nozzle, stayed behind in Geneva. Although Middlemore was himself ill, he made a number of important first ascents from his base in Pontresina with Maurer, Cordier and Jaun, starting with the first ascent of the serpentine Biancograt (White ridge) on Piz Bernina on 12 August 1876, the Monte Rosso di Tschierva (a first ascent) and Piz Roseg from the Tschierva Glacier. On the first ascent of Piz Roseg's north ridge on 18 August Middlemore's foot was injured by a loose stone, causing him to faint from pain; Jaun prevented him from falling.