Waiting To Take Rome: How To Civl War On Purpose?

[Siris]

Just wondering, how do you make the civil war on purpose? I've placed nine legions of mine, and yes, their legions, on the unit setting Huge next to Rome, and await the Civil War so that I can instantly first-strike the city. I've not done any Senate Missions for like 30 years in there, yet my scores with them still is like four highlighted ovals; so how do you purposely make the war?

Here is the screen shot of the military I have next to Rome. I'm not going for large conquest right now, just focusing on getting the Civil war on, so not much land, like 11 cities or something total, but most are almost totally built up.

~~ (**Update**) The screen shot shows only 8 stacks, but that was before I moved down another ~~

Each of those stacks is comprised of this, the ones next to Rome that is:

10 Units of 161 Legionary Cohorts
5 Units of 108 Roman Calvery
4 Units of 161 Archer Auxilia
1 Family Member General of varying from 40-80

My spies tell me, that Rome only has 22,000 citizens alone, so if my calculations are right, which they are, my army alone is larger than not their military, but their entire populace as well, now that's huge!

Senate army: Residing around 2,000 soliders.
Senate (Rome) Populace: Residing around 22,000+

My waiting legions comprising my Southern Strike Army: 25,596

Think I'll win? Man that battle will be huge. Be nine of my armies (if it allows all of them) plus the enemy army and the city at once, since all of mine are commanded by the Faimly Member Generals. Cant wait!

But still, how do I start the Civil War on purpose?