siege weapon field tactics

[Productivity]

I tried a brief experiment with seige weaponary, i tried them in a battle where i thought they would excel

I fought a defensive bridge custom battle against the geramns, and i gave them 50% points than i had (give them a little chance).

My army was 3 units of triarii, 1 first legionary cohort, 4 auxilia archers, 6 repeating ballistas, 4 onagers and 2 heavy onagers.

Long story short, the top killers where the archers

The artillery did kill a lot of germans, unfortunatley as the germans advanced i had some firendlty fire problems, and a charcoal general

i said earlier in this thread, and still think, that i would rather have a unit of archers than any artillery unit in a non-seige battle

That's the worst battle for repeating ballistas (or ballistas and scorpions for that matter). They can't differentiate targets on bridges because it is so crowded. Repeatign ballistas are good for killing two hit point units, or ultra high armour units, things which archers struggle with. Fire them into low-medium quality/cost units and they are never going to be cost effective. Fire them into high quality/high cost units and they will be worth it.