How many in Battle of 5 Armies?

[Eönwë]

Originally Posted by Gwathagor

The strange terrain would not have worked in favor of either army, as both were out of their element and therefore both at a disadvantage. The elves were used to forest and the dwarves to caves.

I think that just about sums it up. They would have both had many casualties due to unfamiliarity of the terrain.