Hewhoknowsall
There is an epic war in Middle Earth, as forces meet in a civil war. The below are a few of the battles that raged in it. Who do you think would win in each 
Setting: Open plains, except for army battles which are large scale, strategic
Rules: None
Mumakil vs Treebeard - Mumakil is far bigger, but then again Treebeard is a named character (which automatically increases your power in most movies), and the leader of the ents
Balrog vs Witch King - The Balrog is much bigger and all, but can size triumph over the leader of the nine?
Gandalf the Grey vs Smaug - Once again, the size difference is enormous, but Gandalf defeated a balrog
Aragorn vs cave troll - can the very skilled ranger beat a huge monster?
Gondor vs Rohan - Gondor is more professional and has fortified settlements, but Rohan has a very formidable calvarly force
Mumakil vs Gandalf the White - enormous size difference, but Gandalf is...well, Gandalf, and defeated a balrog when Gandalf was in a weaker state...
The fellowship vs the nine riders - Can the nine walkers defeat the nine riders?

Setting: Open plains, except for army battles which are large scale, strategic
Rules: None
Mumakil vs Treebeard - Mumakil is far bigger, but then again Treebeard is a named character (which automatically increases your power in most movies), and the leader of the ents
Balrog vs Witch King - The Balrog is much bigger and all, but can size triumph over the leader of the nine?
Gandalf the Grey vs Smaug - Once again, the size difference is enormous, but Gandalf defeated a balrog
Aragorn vs cave troll - can the very skilled ranger beat a huge monster?
Gondor vs Rohan - Gondor is more professional and has fortified settlements, but Rohan has a very formidable calvarly force
Mumakil vs Gandalf the White - enormous size difference, but Gandalf is...well, Gandalf, and defeated a balrog when Gandalf was in a weaker state...
The fellowship vs the nine riders - Can the nine walkers defeat the nine riders?