Even if they won the battle Sauron would still crush it under his heel.

Sauron would've won and conquered Middle-Earth if it wasn't for Ilúvatar's intervention at the end.

You know, when Eru held up a tripwire and made Gollum fall? All the victories wouldn't have mattered if that hadn't happened.

Id probably use high tech weapons like crossbow

So i'd just arrest denethor for treason before he was born, so that solves that problem. Gondor doesn't become weak.

as high steward who hates goblins and dragons and spider riders, removing the goblin and dragon problems from the elves and the dwarves in rhovanion would have caused turbo prosperous trade and logistical routes.

then i would have seiged the black gates and smashed minas morgul with a rhovanian coalition faction before isengard could form the palantir internet connection with the dark lord.

then gandalf and sam and frodo could just meet up and casually walk to mount lava to get rid of the ring, gandalf would have just wizard blasted gollum into the next dimension, so there'd be no interruptions.

saruman gets arrested by the istari and taken before the valar courts for unspeakable multidimensional punishment.

then i'd just crown aragorn high king because i dont want to do the paperwork and go eat wings and beer with the hobbits at the pub 👍👍