Going on the offensive as Hayasdan

[Biowulf]

In my Hayasdan Campaign I made the largest army I could with 14k mnai. It was a mix of Caucasian Spearmen, C. Archers, Armenian Spearmen, and a couple skirmisher cavalry with my FL. First thing I did was use this army to wipe out every Seleukid army nearby, which cleared the way for the army to take Phraaspha and Ekbatana. With this new income I was able to retrain a bit and get a few more units and I marched on Mesopotamia. I started with Karkathiokerta, Edessa, and Susa to encircle the middle of the Sele's empire. At that point I was making enough money that debt wasn't an issue and I could take any city whenever I wanted, which I did and now the Sele's are split in two.
Some things to remember as you go along:
Don't worry about debt. If you win enough you'll make money.
Don't worry about retraining until you absolutely have to. Just merge units and fight all battles yourself. I used basic hammer and anvil tactics against even the elite phalangites and went mano e mano with my FL against their general. In no time he was a 2 gold chevron killing machine with 10 command stars.
Once you have the money, make little relief forces to chase away the small Sele armies that besiege your cities. They usually will send 2-4 units if your city only has an fm or single garrison unit.
I hope this helps! If you need more I would be happy to oblige.

[vollorix]

You can trick the AI a bit by luring their armies into your lands, while your towns are very lightly defended. That way the AI will send apropriate, small raiding parties/quoter stack contingents, since your homeland seems undefended. Now, all you need to kill those are 3-4 HA ( Skythians are cheap and available in Mzkheta and Kotais ) + 1 FM ( to charge weakend units and rout them ) + 1 medium cavalry ( to double the charge, deal with Seleucid FMs, since they´re armed with axes = ap weapon, and to cut down routers, since your FMs are too slow and have only "good" stamina ). You can ambush their forces, or you can wait untill they´d besiege your towns. You also can leave this small army in a town, as a garrison, while FM makes money as gouverneur, he still will be leading sallies and won´t get bored, gathering command experience etc. The sally tactic is especially effectiv with the "horse" army i describe above, for couple of reasons:
1. You can sally at least twice before the enemy would build a single siege engine: if you haven´t managed to rout the enemy in the first turn, you simply withdraw into the settlement and wait till battle time is over - it counts draw ;)
2. While you sally, the enemy mostly tries to reform at some place initially different from where they start, so you have "free shots" at their backs, especially at the slow moving phalanx units.

Heroic victories are guaranteed!

Now you are free to go pillage enemy lands, sack their cities, cut their reinforcements, ambushing them wherever you can ( just use the same army composition as described above, and don´t bother with food soldiers - you´d need them only facing really large enemy armies, and for siege purposes. 4 FM in a stack - i never do that, 2 are maximum, 3 only if i face multiple enemy FMs and got faction leader or heir, kind of Roayl Army then.

If you own Karkathioherta, the defence is pure fun - then you don´t need any HA at all, only an FM and enough archers + some spearmen to hole the line long enough ( that´s because of the terrain around the city ). And don´t forget slingers - once Seles start to send elites against you, HA are a waist of time against their armour, even silver chevroned ones, but you slingers would shredder them to pieces if they get a clean shot at their backs!

Hope, this helps.

[Potatomade]

My method is to train archers almost exclusively. Caucasian archers are absolutely ridiculous, and if you're fighting a large enemy like the Seleukids, you'll get plenty of chevrons. Usually what I do is wipe out all of the Caucasus, then park a fullstack of archers at Karkathiokerta, and watch the enemy die. Getting gold chevrons without losing a single man? Priceless.

For sieging cities, always use your archers to shoot over the walls (if they're wooden). You can easily kill 70% of the enemy army that way, without even having to get through the gate first. Also, if you don't mind messing with the diplomacy A.I., you can always ceasefire the Seleukids every turn (I guess since they have so many enemies, the diplo A.I. is desperate to have friends). You can easily do that for thirty years if you have to.

[Tuuvi]

Thanks for the advice guys.

My method is to train archers almost exclusively. Caucasian archers are absolutely ridiculous, and if you're fighting a large enemy like the Seleukids, you'll get plenty of chevrons. Usually what I do is wipe out all of the Caucasus, then park a fullstack of archers at Karkathiokerta, and watch the enemy die. Getting gold chevrons without losing a single man? Priceless.

For sieging cities, always use your archers to shoot over the walls (if they're wooden). You can easily kill 70% of the enemy army that way, without even having to get through the gate first. Also, if you don't mind messing with the diplomacy A.I., you can always ceasefire the Seleukids every turn (I guess since they have so many enemies, the diplo A.I. is desperate to have friends). You can easily do that for thirty years if you have to.

Ha yea Caucasian archers are great. I think I might have Karkathiokerta already, I wonder if I should build stone walls or keep them wooden?

[Brave Brave Sir Robin]

Stone walls definitely. This gives your archers a major advantage. The only thing is that if the Seleucids get units onto the wall, you have to let them since your infantry is no good on walls.

I also find that sacking Seleucia gives you a major financial boost, one which can finance mines which will eventually support your armies.

[d'Arthez]

Definitely stone walls. Makes defending much easier, especially if you have a few units of Caucasian archers and Eastern slingers there. If you can back up the defence with a unit of cavalry to deal with the pesky siegers that may reach the walls you should be able to defend quite easily.

[Tuuvi]

Stone walls definitely. This gives your archers a major advantage. The only thing is that if the Seleucids get units onto the wall, you have to let them since your infantry is no good on walls.

I also find that sacking Seleucia gives you a major financial boost, one which can finance mines which will eventually support your armies.

Definitely stone walls. Makes defending much easier, especially if you have a few units of Caucasian archers and Eastern slingers there. If you can back up the defence with a unit of cavalry to deal with the pesky siegers that may reach the walls you should be able to defend quite easily.

Ok I will build stone walls then. Are scythian or eastern axemen any good on walls? Because I remember hearing that spear units are no good but I've been thinking that the axemen might be good since they aren't spearmen and because of the AP bonus.