THE UTAH REBELLION-Says the Washington Union.-
"There can be no doubt that Brigham Young is or-ganizing a most formidable opposition to the authori-ty of the federal government in Utah. The notion given out by his emissaries that he contemplates a re-moval in the spring to the British or some other possessions is a ruse; the advices from all the sources over which he has no control, being, that the Mormons, from all portions of our vast western domain, are abandoning their settlements, sacrificing their proper-ty, purchasing immense stores of arms and ammuni-tion, and concentrating together in the Salt Lake val-ley. Thoroughly provided and armed-equal natural-ly and physically to our own men in military prowess-desperate and fanatical in the last degree-occupy-ing a natural fortress, almost impregnable by its topo-graphical conformation as well as by its vast distance from the source of assault-and reinforced by mani-fold alliance with warlike tribes of Indians-the ne-cessity of early and adequate reinforcements from Congress to our army operating against them is ap-parent and imminent."
[As this paragraph has been published in the Union since the receipt of the despatches from the army, which the Secretary of War declines to make public, the information given is probably derived from those despatches.]