I remember reading various different White Dwarf magazine featuring different campaign ideas, ways to tailor your army for a specific campaign (one instance was that a studio Imperial Guardsmen would paint a skull on his Leman Russ every time it blew up an opponent's tank in combat) and each player had a story to tell and heroes of their own from their rosters. They didn't have generic soldiers who achieved only a days victory, but they completed a whole campaign. Some would say those soldiers wen to Hell and back to conquer those planets.
With these two sources of inspiration, I set out to create one of the most ideal campaigns I could come up, but they were always linear tree ones that really weren't successful. They still happened to fall flat and feel stagnant by the end (if we even got to the end) and I soon gave up on the idea.
I guess luckily for me, I've had quite a bit of time since the release to come up with a few awesome ideas to help bring global warfare to the tabletop and make it just as epic, if not more, as Dawn of War.
Battles
Of course what kind of battles to fight might be the biggest problem yet for people who just picked up the set (besides trying to paint all of the freaking tiles. I still only have ten of them painted) and GW suggests making it all completely random. No way, I'm going to do that when I have very well detailed battlescapes in front of me! I should at least try to mirror each tile's terrain on the tabletop and mission wise.
Ruins tiles should have lots of ruins and if you aren't too cheap (like me) then you should use the Cities of Death rules.
If the tile features a Space Port then I would recommend using some terrain to represent the fringes of sprawling cities within and use the Apopcalypse rules. No one ever assaults a large enemy point with a few guys!
And so on and so on trying to match the expansions (or your own homemade equivalents) and terrain to the tiles.
The Start of Global Warfare
Next, the assaulting players should choose a terroritory by some means (I suggest by merely letting them pick and then later see if they can actually claim it by rolling on the provided table along with any assigned modifiers that are provided or made up. Or make it random and don't make them roll for conquest).
After the area of conflict has been assigned, begin a mission of Planetstrike or your own version of it.
If they fail, then continue around the table until each faction has their chance and then repeat the process for each failed assailant. If they continue to lose over and over again, then just give them a territory some where. Just say that through continued assault, scout forces were able to infiltrate and establish a foothold or something like that.
Once the assaulting factions establish their footholds or strongholds (look for some ideas on this topic later), the above ideas can be implemented across the planet.
Continued Assaults
Once the determined conquerors break the defender's defenses, they will need to continue on with invading adjacent territories or they can keep doing Planetstrikes (I would suggest that you nerf the amount of times they can do this. Otherwise it might get kind of out of hand). Use the above guidelines for terrain and the usage of expansions (I realize I sound like a GW marketing pawn here, but bear with me), but don't be hesitant to add in others!
If you don't want to use so many different types of expansions then you can just use your own scenarios or even the battle missions from the rulebook. Tailor them however you want, but make sure that no side has a clear advantage and if they do, then nerf them somewhere else. Example: Chaos decides to play a mission in their favor, Imperial Guard player doesn't really want to, but accepts it anyway. Nerf the roll required for Chaos to take over the planet.
That's it for part one folks. Don't be afraid to leave any questions in the comments section just in case I wasn't clear enough (sometimes I get a little too excited and skip a few details), or send me shout outs via Google+ or e-mail. I'd be more than happy to explain more in-depth, provide advice or clarify that long list of text.
Soon to follow up in this series will be some ideas on Campaign Heroes, unique characters/squads, strongholds, victory, Allies, unique tiles/campaign map structures, and more! I've got years of ideas built up folks, so get ready because Global Warfare is coming to your tables soon.