I believe it mentioned a ram at Helms Deep, didn't it? That is, a tree from the area used as a ram (unlike the prebuilt ones in the game and film).
At any rate, the rams will be used in general because they can be made on site out of trees... Other engines would be brought along, probably to be assembled, but still made out of custom cut pieces of wood and metal.
Still not sure exactly how to make this work in-game, but it's a start.
Are there any places where it actually mentions ballistae in the books? Or just catapults and the like?
Anyway, this being the case, the Elves might have ladders and ballistae, though probably not mines. These will all mainly be used for fortress maps, however (likely being only available in fortress maps) so the Elves are still a bit stuck. They should have an easy siege weapon that can be made on the spot like the rams... I can't really think of anything. It doesn't really make sense for the Elves to cut down trees, though.
Edit: Also, just to keep this in mind, the main focus of the Elves faction for me is the Mirkwood and Lothlorien Silvan Elves. They had the greatest recorded influence in the War of the Ring and I think that should be shown. So it's preferable to use engines of war of Lorien and Mirkwood in the faction if at all possible.
Edited by Gfire, 09 June 2009 - 04:19 PM.