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According to many commentators (see Manar IV, 112), this interpolation is justified by the preceding two verses, which show that it was the Prophet who, under divine inspiration, made this promise to his followers. See also 8:9 , where a similar promise is voiced on the occasion of the battle of Badr.
Whatever happens, whether there is a miracle or not, all help proceeds from Allah. Man should not be so arrogant as to suppose that his own resources will change the current of the world plan. Allah helps those who show constancy, courage, and discipline, and use all the human means at their disposal, not those who fold their hands and have no faith. But Allah's help is determined on considerations exalted far above our petty human motive, and by perfect wisdoms, of which we can have only faint glimpses.