I encountered massive action quite quickly in this campaign.
About 4 turns in, the Seleucids grapped one of the nearby settlements with my Culture.
About 4 turns later, the same settlement rebelled in my favour... bringing the alliance between me and the Seleucids to an untimely end.
Needless to say, I was rather panicked by this sudden enemy. I was still scraping together my first stack.
At any rate, seeing as I was now put in serious trouble, so I immediately jolted forth, to try and take a bit of land from them, and thus either trade it in to them for peace, or atleast have the frontlines away from my heartlands.
I came first upon Pinaca, it had no walls and little garrison. And with the bow and arrow, the city was taken.
Next I sent my spy south to Arbela... And it had no garrison.
So I left Pinaca with the minimal of Garrison and rushed down to take Arbela. Next was Opis.
From there, I went to Babylon and Seleucia, and oddly enough I was still meeting only the tiniest of resistence.
At this point in time, I had managed to scramble together two more armies, one which was sent down to stabilize the newly gained territory in the middle-east, while the other was sent to repel what small armies came from Antiochea and the coast.
Strangely enough, aside from scripted armies, I met only a very small amount of resistance, rarely did they collect their troops in armies larger than a handfull of units, which meant that the majority of them was shot down by my archers, before even reaching my lines.
They seemed to prefer to instead of amassing into armies, to have several groups of units spread across the campaign map, fun stuff for archery.
At this point in time, the tiny armenian kingdom, has grown into the largest empire in the world... the Seleucids are left with only with Bostra