Abstract
No doubt taking his clue from a book published by Friedrich Paulsen under the title Philosophia Militans, Albert C. Knudson placed a chapter in his memorable history of personalistic idealism called “Militant Personalism”. And he raised by that very title, as Paulsen had earlier, the question of the actual forcefulness of philosophical ideas on history and society. Another book, issued three years after Knudson’s, was called Behaviorism: A Battle Line. This volume of collected essays, edited by W. P. King, made the point that behaviorism as a philosophy of mind had such serious negative implications for human beings and the social order that it must be vigorously opposed and literally fought against.