Battle for Middle Earth - Evil Campaign - Osgiliath

Battle for Middle Earth - Evil Campaign Map - Osgiliath (+50 Command)
This is a hint/walkthrough post for Battle for Middle Earth. You can find an index of all our Battle for Middle Earth posts here.

This map starts out hectic but is actually quite relaxed because the enemy bases are generally passive. They will send out small sorties, but mostly group their troops just outside and stay on the denfensive.

Because of the trebuchets and the herd of elite horsemen in the first half of the campaign, you will probably just want to hold on to your catapults and spend free Orc Warriors like water. Build up a sizable force of Orc Warriors in two groups and attack each location from two or three directions if possible -- sending a continuous stream doesn't really help and just draws trebuchets toward your camp.
Send in the Orcs first to draw fire from the trebuchets so that your catapults can counterfire and take them out. Take the two camps on the east side of the river and build up perimeter defenses to help with small enemy sorties.

Take one bridge to access the west side. Try to secure the archer towers with your own archers, but it is not really necessary. After clearing the final Gondor encampment on the west side, leave one or two buildings in the encampment standing so that you can arrange your forces -- otherwise, the mission ends immediately.

By the time the horsemen show up, you will probably have the Nazgul. You are probably using free Orcs at this time, so throw whatever forces you have to stop your advance, and send your Nazgul in to attack the centre of the horsemen herd. The Nazgul have an area effect attack, and can devastate the horsemen quickly.

You get Drummer Trolls in this mission, so your final force leaving the map should include them. You can only build Orcs, Trolls, and Haradrim, so I recommend a sizable force of combined Orc Warrior-Orc Archers, backed with Drummer Trolls, plus a few Trolls.