Quote Originally Posted by Bigwig
As I was building up for my attack on Rome (and the subsequent civil war), I made about 5 of these "prepackaged" armies that consisted of 4 heavy onagers, 4 archer auxilia, 2 praetorian cavalry, 6 legionary cohorts, 3 urban cohorts, and the general. These armies have been proven time and again to be uber flexible in both the field and in siege situations.
I did the same thing, I found a formula that worked and just kept cranking out cookie cutter armies, mine were similar. Question: why 4 onagers? And why 6 Legionary Cohorts and 3 Urbans instead of just 9 Urbans? Maybe I missed something in the stats? Anyway, here was mine:

1 General
2 Roman Cavalry
2 Praetorian Cavalry
2 Heavy Onagers
4 Archer Auxilia
4 Auxilia
5 Urban Cohort

I find fewer Onagers gives me a bit more flexiblity when attacking. I'm a bit weaker on sieges but 2 Onagers can destroy both the gatehouse and the door on Epic Walls. 4 would be nice, to make multiple holes, but all you need is 2.