3 ideas
Guerrilla forces should act as an intangible influence spread across vast space, not as a body that holds ground or offers a target. An army that is nowhere in particular cannot be attacked, so conventional forces must garrison everything and defend everywhere, while the irregulars choose when and where to appear.
For a small insurgent force, men are the scarcest resource and cannot be replaced, while the enemy's railways, bridges, guns and supplies are both easier to destroy and costlier for him to lose. Leaving the Hejaz Railway barely working was better than cutting it outright, because it kept Turkish troops tied down guarding and repairing a failing line. The goal is to paralyse the opponent's system, not to win battles.
Lawrence persuaded Arab fighters to risk their lives on the promise of self-rule. He was aware of the Sykes-Picot agreement, the secret 1916 Anglo-French plan to divide the region, and knew that promise was unlikely to be kept. Seen this way, the intermediary is not a neutral technician. His effectiveness depends on trust he knows he is spending falsely, and that knowledge brings a moral debt and a shame that success cannot cancel.