Galactic Patrol by E.E. Smith

It had taken the Lensman a long time to work out in his mind exactly what it was that he had wanted from the Arisians, and from no single source had the basic idea come. Part of it had come from his own knowledge of ordinary hypnosis; part from the ability of the Overlords of Delgon to control from a distance the minds of others; part from Worsel, who, working through Kinnison's own mind, had done such surprising things with a Lens; and a great part indeed from the Arisians themselves, who had the astounding ability literally and completely to superimpose their own mentalities upon those of others, wherever situate. Part by part and bit by bit the Tellurian Lensman had built up his plan, but he had not had the sheer power of intellect to make it work. Now he had that, and was ready to go.

Where? His first impulse was to return to Aldebaran I and to invade again the stronghold of the Wheelmen, who had routed him so ignominiously in his one encounter with them. Ordinary prudence, however, counseled against that course.