Who said that "when (guerrilla warfare) is directed by a leader with a genius of war, an effective (counter-insurgency) campaign becomes well-nigh impossible"?

Question

Quizplus · Accepted Answer

C.E. Callwell made this observation, recognizing the challenges conventional forces face when confronting guerrilla warfare led by a highly skilled leader. This insight is part of his broader work on small wars and irregular warfare, where he analyzed the dynamics and difficulties of counter-insurgency efforts.

Who Said That "When (Guerrilla Warfare) Is Directed by a Leader