Since I'm now the dominant game power as Gaul in a medium/medium game and this guide is still so short, I thought I should write something here.
Here's what I did:
Build ports where you can and traders elsewhere to increase income. Roads or farm upgrades might be more suitable for the first turn, thinking about it. Condate Redonum and Narbo Martius need palisades no later than about turn 4.
Turn 1: Build diplomats in Numantia and Alesia. Build warbands in Mediolanium and Patavium. If you don't build troops elsewhere, your towns grow quicker.
Put the army outside Patavium into the city. Send out all troops in and around Narbo Martius except a single warband towards Masilla. Move your boat near Condate Redonum to discover Samarobrivium and afterwards use it to scout for British forces about to attack Condate Redonum. Move your spy to scout around Italy and prepare for an attack. Move your current diplomat to sell maps to the Romans over the next few turns, but don't chose to receive "regular tribute" any time after turn 4.
Turn 2. Build barbarian cavalry in Alesia ready for the British attack. Continue building warbands in Patavium and Medolanium.
Besiege Masilla with your army from Narbo Martius and build battering rams. Send your diplomats west from Numantia and east from Alesia to meet the Spanish and Germans. Negotiate trade rights and an alliance, exchange military access and sell your maps to them both. If you attack the Romans before this point, you may not get military access, in which case they may break the alliance. You will probably actually enter negotiations on turn 3. After this, these diplomats should be selling maps to Carthage, exploring and bribing rebels armies.
Turn 3: Continue building troops as before. Build a warband or two in Condate Redonum.
Assault Masilla then build a garrison unit. You should occupy, not enslave so that the populations grows enough to remove the culture penalties quicker. Build roads first in Masilla. If you have been building those economic improvements and selling maps, you really shouldn't need to exterminate.
Turn 4: Keep building troops as before.
Send Masilla army towards Lugdunum. Move all units out of Mediolanium and Patavium except a warband in each, merging the two armies on your border with the Julii. I may have actually left this step until a turn later, I forget.
Turn 5: Keep building troops as before.
Besiege Lugdunum. Besiege Arretium. You should be selling maps to the Carthaginians in Corduba about now.
Turn 6: Keep building those troops.
You should now have roads, a trader and land clearance in Mediolanium. Build a stables there to help the push into Italy. IMHO, massive cavalry superiority is the only way for Gaul to beat the Romans. Keep building improvements in your other cities, as long as you can afford it.
Assault and occupy Lugdunum. Build a garrison unit and roads.
If the Julii haven't just attacked your besieging army, you now need to assault Arretium. I just occupied, since many of the Roman cities have populations of about 5000 at this stage of the game and hitting 6000 will allow you to reduce culture penalties as well as building Barbarian Noble Cavalry, Chosen Swordsmen and Foresters. Retrain all the units you can back to full strength.
Britannia will now be moving on Condate Redonum, thinking you're weak because of war with Rome. Move your Alesia army to within striking distance of Samarobriva, leaving your faction leader, a warband and a unit of cavalry behind. You should be building another unit of cavalry for the next turn. You may find this should happen one turn later.
Turn 7: Keep building improvements.
In the North, sally from Alesia if attacked there. Besiege Samarobriva. Ignore Condate Redonum, since Britannia will turn back to relieve Samarobriva and you will be able to hold them off with your warbands anyway if they do try to assault.
In Italy, do not attempt attack the Senate army until you have built up more troops, including cavalry from Arretium, and until you have taken Segestica and then Ariminium. By this time, your army that was taking Lugdunum should be about to arrive as reinforcements, and you should have about 9 full units of barbarian cavalry on the field. After I started to besiege Rome, I was attacked twice in one turn by the senate, leaving me with Rome, but most of my barbarian cavalry units with only 10 to 20 men. All those Roman generals and principes in one stack are unbeatable if you don't have enough cavalry to counter, as I found out when I got too cocky after taking Arretium the first time around.
After you take Rome, it's easy, just watch out for amphibious landings in western Italy, particularly if the Julii are still left in Caralis. Don't try to compete with the Roman navies, just hop between your new ports and take their cities. The only other important tip is to make sure you don't leave it too late to take Iuvavum (in the Alps) from the rebels.
You might like to shift your capital to Italy once you take Rome. I chose Arretium. At this point, you should only have about 36 cities to go for victory.
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