Colonel M W H (Henry) Day, MA, CEng, MICE, Royal Engineers was a British Army Officer (retired 9 April 1997)[1] who made the first British ascent (second ever ascent) of Annapurna I.
[2][3] In addition to the first British ascent of Annapurna, he was an active member of the Army Mountaineering Association (AMA) and a member of the Alpine Club (UK) contributing to the Alpine Journal.
[4] He was an active climber in the Alps and took part in the first winter ascent of the Grands Charmoz with Rob Collister.
[8] He led a Royal Engineers expedition to Trisul II (1978)[9] and in 1981 a British Army expedition to the Da Xue Shan mountains in Sichuan province, China attempting to climb Jiaz (6,540 m).
[10] In 1987 Henry Day led the climbers attempting to climb the virgin east face of Xixabangma (8,027 m),[11] in China, organised by the Scientific Exploration Society with a view to conducting scientific research en route.