[William Cloud Hicklin]

Well, Tolkien also says (in Letters IIRC) that one of the One Ring's powers was that of Command: an Aragorn wielding the One could not only have forced Rohan and Gondor to do his bidding, but possibly could have turned the Dunlendings, Haradrim and Easterlings as well. Depending on the level of his fall, he could perhaps even have suborned orcs to his service!

All of Sauron's victories, aside from the corruption of Numenor, were accomplished by brute force- whether commanded by him directly, or through proxies like Angmar and the Wainriders. As much as anything, Sauron's desire was to be a lord of slaves. The Ring would have reflected the will that made it- see what happened at the Black Gate when the Ring was destroyed? (note that even in the War of the Last Alliance, Sauron didn't come out to play until all was lost, expending his servants' lives instead)