Devil’s Thumb. In Climbing of January-February, 1978 there is the report of the first ascent of the pillar which divides the northwest face of the Devil’s Thumb, made between August 16 and 19 by Bob Plumb and David Stutzman. This Grade VI, 5.9 climb was made in 57 pitches from the Witches’ Cauldron. It was climbed completely free.