If the US and Britain don't expand the war on Iraq, I don't think the reasons for it will be attributable to metaphysical forces. It may, however, be at least partly attributable to intensely focused human intentions to avoid war on the international level, followed by intensely focused human political actions on the international level.

Prayer, or meditation, or whatever form of communication it is that people use to focus their attention, has historically been a lousy means of preventing war and violence. It is an excellent means of focusing one's attention on preventing war and violence, and one's intention to take right action to prevent war and violence.

But relying strictly on prayer/meditation to defeat the forces of tyranny, malevolence, etc. is a well proven recipe for tyranny, malevolence, etc to remain firmly entrenched, and largely unchecked.