The Orks are betrayed by Ronahn and have to fight through the armies of Autarch Kyre.
General Notes[]
This is a very straightforward base assault mission of Orks vs Eldar, with the only complicated part on Hard difficulty being your initial defense; get some Deffgun Loota, Dawn of War III/Tankbustas and Dawn of War III/Shoota Boyz squads over to the Heavy Cover dome at the northwest entrance of your base quickly, then just start the typical buildup.
You will need to destroy multiple bases spread out along the map, and given the Eldar's poor abilities at anti-vehicle combat and the Ork's excellent vehicle production capability through using Scrap at half cost, a focused army of Deff Dreads, Big Trakks, several Gretchin repairers and a Trukk for reinforcing the Gretchin will just steadily mow through the enemy, stopping occasionally for repairs. There are multiple resource pickups also spread out around the map, and you should be creating the occasional large pile of Scrap through combat which will let your Gretchin build more vehicles on the fly.
Once your main attack force is built, upgraded and moving, there is no real need for complex strategy which is just fine for Orks! Go big, go stompy, and smash everything in sight.