So yesterday I won the achievment playing Eastern Rome. I personally think that it is absolutely impossible to win as West Rome.
Here is what I did:
1. Set all your cities to full production. Most will stagnate in growth which is good because you are low in happiness anyway. Still set them on "no growth". Then set the cities closest to the borders on scouts and spearmen. In the background build swordman and bowman. If you got a good feeling save it. At turn 0 nothing moved.
2. With that savegame you can start the most important. I lost only 4 cities. Trapezunt will go to the Huns. Melitene and Edessa to the Sassanids. And Naissus will go for very short time to the Goths. Vandals get nothing.
Now as far as I remember:
Therefore I moved one legion backward. They were put on the hills so the Vandals could not conquer
Seleukia. Another legion close to Antiochia building the first fort. This alone would not have saved it. I managed to move 2 dromons there to sink their ships fast enough.
Mistra was defended by scout and dromon. Scouts were always used to block enemies pumping them out within 2-4 turns usually is a good choice if you got no time. The dromons in africa had to stay there for the first turns. Moving them out they get killed and belong to the Vandals.
About
Naissus you will first retreat to Adrianopolis and save Drachyium and save your greek units to Sirmium. You really want to Goths to try to split up a bit but mainly focus on Naissus so you can take out most of their army defending Sirmium and Adrianople. Doing well you should be able to gain back the low 13 points Naissus with just 3-4 turns using bowman, cataphracts (which i build mostly in constantinople besides dromons) and your legions.
Now comes the main key to success.
Thedosopolis should not be conquered by the huns or anyone. This seems almost impossible but it has bigger walls than Trapezunt and with some luck the Sassanids and huns will kill each other. Later in game the huns will be that strong you cannot take it back. I tried it with different games and strong armies. No way. I shot mostly hun battery rams or red units to kill them. At around turn 4 or 5 there was no unit left around Theodosiopolis so I started moving my first northern units close to the mountains to Theodosiopolis with another legion so they cannot take it back.
Saving Theodosiopolis you have a good chance now to conquer back the fast improving (wall around 24) Trapezunt back from huns with dromons. Did that around turn 20-25.
So what about
Edessa ? Once conquered its still a weak 13 city. If you defend antiochia well and got your first units from south up there you should be able to reconquer it with 4-6 units using the legion that has built up the fort.
And
Melitene ? Well thats an ugly one with wall 24. But if you got Edessa back and the Hun city in north you can easily surround it. Try take it back once you get a general. But still try before turn 30.
Now about the defense.
Once you gain back a city of you you will let it grow to around 3 and instantly build wall.
I used my
first general from south to take back Edessa and improve therefore troop strenght. After taking Edessa back I used it to build a citadel the second space on the hill east of it. Its out of the 2 square range from the other Sassanid cities and gives you more territory. Then you can control the hills with just 2 bowman and 1 spearman easily. Later on the Sassanids (turn 40-50) will attack with a giant army. If you move some troops to Palmyra they will not attack there but near Edessa. But with this citadel you can easily kill them all.
My
second general from Constantinople was used to take back Trapezunt. Then I used it to build a citadel east of Theodosiopolis (the one north to the sheep and out of range of Anium - the other one was set up later) which did a very good job too.
The
third general is not building a citadel. It just increase the strenght of all troops near Naissus. There you first reconsturct your infrastructure and then build a lot of forts in north to the Goths with 2 squares each. With like 10-15 units the goths will never come back. Before their next massive attack you will have time to take back the west roman city in the west using dromons as help.
With all that you will have your cities back and borders saved. Always make sure you use rough terrain and your units are in a straight line so the enemy get no bonus.
Now about the
dromons. After saving Seleukia I instantly moved all my dromons to the west roman coast. 3 on each side to prevent the attackers. It will not save Ravenna but it will give west rome some time (and points). I even managed to save Rome itself up to turn 70.
Use another 5-6 dromons and an admirale near Carthago. The vandals will have around turn 50-60 such an incredible fleet that they will still take out all these dromons but this way you save carthago and more important your own african cities.
Social policies:
First screw up your walls. Almost no city has walls so it doesnt matter. Next is your money. Then again your money. I was red the whole game in gold but it doesnt matter. You have more than 20 cities so 1 unit killed per turn or per 2 turns doesnt matter. It mostly kills your scouts that why I build them in weak cities. Sometimes it also kills red units therefore I lost 3 legions. Last I chose the politics that gave a -10 % bonus but at this time I had back all my cities and enough generals and forts so it was not much of a difference. The ursurper was not to chose. It had been the 5th. Avoid the happiness policy.
Enough said this is me at turn 67.
http://imageshack.com/a/img716/2311/3ewq.jpg
I also made a picture of west but for somewhat the screen got black uh ? maybe later try it again.