But what happens if Sunni nationalists and Shi’a nationalists (Sadr’s people) form a more effective alliance — not just to campaign against the constitution, but to wage guerrilla war against the ruling coalition and the American forces supporting it? The U.S. Army proved last year it can wipe the floor with Sadr’s militia in a head-on battle, but what if the Sadrists adopted the same sneak-and-run tactics as the Sunni insurgents?