Final Liberation tells the story of a planet which falls to the Orks (one of the many races in the 40k universe). Only one area remains lightly defended, and after an assault by Imperial Space Marines, this area forms a beachhead for the Imperial Guard, who are then tasked of reclaiming the planet.
During every campaign turn you move your armies across the map and attack the Orks. You can expand your armies with new units and even add extra army groups so you can more effectively fight the Orks. When attacking an area, you move to the battlefield and fight a turn-based battle. You quickly learn to keep a good eye on morale: units might run away if they come under fire, and if they run of the battlefield, they're gone. It also means you don't always have to completely destroy the enemy. Taking objectives and destroying big units like Titans have a huge impact on morale!
Winning battles gives you points, and with enough points, expand armies and buy units. You can also earn new armies by conquering certain areas of the map, with the description of these areas giving you hints on what might be there. The first time you get a Warlord Titan, accompanied by a lovely cut-scene, is a great experience.
Speaking of cut-scenes, these are something special. Not only because of the now famous commissar Holt, who supports you in your role of commander, but they bring the Warhammer 40k universe to life via a mix of CGI and real-life actors.
The game is easy to learn, and not that hard to master. When you figure out which units work well with each other, you can almost win every battle against the AI.
The manual adds extra value: it not only teaches you how to play the game, but gives extra information on Volistad and the many units available to you.