"The Scientist Takes Over", review of C. S. Lewis, That Hideous Strength (1945) by George Orwell, Manchester Evening News, 16 August 1945, reprinted as No. 2720 (first half) in The Complete Works of George Orwell, edited by Peter Davison, Vol. XVII (1998), pp. 250–251.
Lyndsay's Middle Scots usage of strength was in the now archaic meaning of "fortress, stronghold", see also OED s.v. strength, n.: "10.a. A stronghold, fastness, fortress. Now arch. or Hist., chiefly with reference to Scotland."