Alright well, Id suppose I'd throw up my Germania strategy for the Campaigns.
Well, the beginning of the campaign must be started with the building of roads in every settlement. After that is done, Trader, then farms, and then temples. Usually at this time in Damme, Trier, and Montagocium, the training of Spear Warbands should be done. Send your diplomat(s) to get trade rights and alliances with the surrounding barbarians (Britian will not ally with you, but Gaul will, as will Dacia). Send your spy into Alesia, you'll need it later.
Now, the shrines I perfer for each city are;
-Damme~Woden
-Montagocium~Woden
-Batavoridium~Freyja
-The one south of Vicus Gothi`Freyja
-Trier~Woden
This is due to the fact that the cities with Woden are going to be the ones that have the biggest starting populations, and therefore will be your "Military" cities (I.E., where the majority of your troops come from). Now, after a turn or two, two Warbands and a General should be taken from the town south of Vicus Gothi (A group of peasants should be trained and left behind) and take Vicus Gothi. The rebels will come out several times from the non-existant city walls, but as long as you keep up the Phalanx wall, you will defeat their attacks easily. Take and attack the city in the same turn. Then move your general back to govern the other city.
A similar strategy should be handled for Bordsholme, with a couple Spear Warbands and A General sent to seige and take the city. Now, you should be moving your troops mainly from Montogocium and Damme to Batavoridium and some to Trier if you're not training Warbands there every so often. now why these two towns? Because, Britian and Gaul will target these two cities mostly. Now, after a half-year or so Brittania will come knocking. Take all your troops in Batavoridium and strike back (Leave a peasant to garrison), driving for Belgicia and Samobriva. Lay seige to it, and fight off any incursions by Brittania to save it. your army should have a couple Merc Calvary, a General, Spear Warband (4-6 would be good), and some Skirmishers are nicely rounded. Now, while doing that, take the army in Trier, and dive into Gaul, perferably Alesia first. Keep Diplomats moving around getting alliances even as you start to take out the Gauls, probably by now you should start making treaties with the Romans. Now, if you're lucky, the spy will grant you the ability to sneak into the capital. If not, seige the town until Gaul sends up an army to stop you, destroy both forces when they do so to take the town. Your army again should haveCalvary, merc if you can't afford regular yet, a General, Spear Warband, Skirmishers, and if you want, Barbarian Merc infantty to guard your SW flanks.
Now, with Alesia and Samobriva in your tow, build some garrison forces, and then with the army in Belgica, strike out for Condate Rodedum. The Army in Alesia should coordinate and strike for Lundugum (South of Alesia). Now the Gauls are attacked two ways, and you cut off land that the Britons can land troops safely. To make sure the Britons cannot take Samobriva back (Oh, they will try), build Spear Warbands in the city to garrison. Meanwhile, back in your home cities, continue upgrading buildings and if you can spare it, building a third small army. If you can manage, take a small force and try to take Bohemium before Dacia can't. If you don't make it, don't worry, the city isn't that important, but it is good for economics.
Now, after taking Lugdunum and Condate Rodedum, strike down to Lemonum from CR, and Massila from Lugdunum (After building two units of Warbands in both cities for garrison, of course). Now, with taking Massila you shave off any attempts by Rome for a bit to get into Gaul, and Lemonum merely kicks Gaul in the britches a bit more while you expand. Brittania will send forces every once and a while to try to take back their coastal city, so keep Samobriva garrisoned and well provisioned.
Well, that's the beginner's steps I always take to playing Germania. After this, I usually take Narbo Martius, garrison it, and then go after the Roman powers with one army heading from the north, and two from the west. I always then handle the Julii, then the Senate, Brutii, and leave the Scipii to their own devices. Spain becomes a problem in the game later on, so never trust them, and Dacia is usually passive, so they're easy pickings if you want more barbarian territory to shift through. Hope this helps you guys.
Nations to play in MIITW:
Holy Roman Empire
Poland