These 1000 m-high rock faces have seen serious
rockfalls in 1950, 1997, 2003, and 2011, which have considerably affected the structure of the mountain and destroyed a number of routes. Although at the time of the first ascent of the north face (
Pierre Allain and R. Leininger on 1 August 1935), Pierre Allain considered the west face to be unclimbable, the team of A. Dagory, Guido Magnone, Lucien Bérardini and Marcel Lainé succeeded on the face in a series of attempts on 5 July and 17–19 July 1952 using considerable artificial aid. Over the period 17–22 August 1955, the Italian climber
Walter Bonatti climbed a difficult
solo route on the south-west pillar of the
Petit Dru (the
Bonatti Pillar); this route – like many on the west face – no longer exists in its original state owing to rockfall, the scars of which remain clearly visible from the Chamonix valley. Seven years later, from 24 to 26 July 1962,
Gary Hemming and
Royal Robbins climbed the 'American Direct', a more direct route up the west face than that taken in 1952. On 10–13 August 1965, Royal Robbins, this time accompanied by
John Harlin, climbed the 'American Direttissima'. This route was destroyed by the 2005 rockfall. ==1966 rescue==