Mongols was mostly horse archers/6.000/ and heavy calvary/4000/ with added 500 nfrantry,mostly engineers,in one tumen.
They would easily destroy Rohan/poor Eowyn!/ ,but other enemies -
1.Elves would schoot them from afar.
2.Dwarwes would do not care about arrows,and repel all charges
3.The...