At the beginning of 1865, the Matterhorn was still unconquered, and more than one assault on it was planned. One such group consisted of Douglas, Edward Whymper, and their guide Peter Taugwalder. Whymper had already made several unsuccessful attempts on the mountain. On 5 July, this group made the second ascent (and the first by the north-north-west ridge) of the Ober Gabelhorn, a peak of 4,053 metres on the north-west side of the Matterhorn; also in July, Douglas made the first ascent of the nearby Unter Gabelhorn (3,391 m) with guides Peter Taugwalder and P. Inäbnit.