In reply to innes:
'Thirty hours on Ben Nevis' by Charles Inglis Clark (after whom the CIC hut is named). An epic on and around Tower Ridge in 1908.
You can find it in A Century of Scottish Mountaineering or possibly now on the SMC website in Journal X 1908.
The weather was so wild that when they topped out 'we were unable to get a light to take compass readings'.
Well worth tracking that story down. It is a pity that the author didn't survive the war.