system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR]How would a leader of Men actually use the One Ring to try to defeat Sauron or other enemies if all it does when putting it on is make you invisible?

Say the Fellowship changed their plan and Boromir was to use the Ring to save Gondor and defeat Mordor, like what Sauron thought Men would do. How exactly would he try to do so? Does he put it on his finger or keep it off when leading his troops? Does the simple act of him having it increase his army's morale?
gpt
The Ring is a tool of domination. A sufficiently powerful being can use it to dominate the wills of others, especially those others that are wearing a Ring of Power, but also those that are not to a lesser degree. If Boromir brought it to Gondor and either he or Denethor successfully used it in the war, it would allow them greater control over their army, the potential to dominate the wills of their enemies, and some small degree of influence over the Nazgûl. As Men, they wouldn't be able to fully make use of its power though, and in any sort of direct confrontation with Sauron, the Ring's allegiance would remain with Sauron. They wouldn't be able to wrest it completely from Sauron's will as Gandalf might have done.