Who here uses artillery in their field battle armies? I've been using ballistas/scorpions in some of my armies but haven't found much use of them. Their range seems severely limited to what I've read on the range of both these weapons. I've been trying to set them up behind my lines which results in a lot of friendly fire, so I tried setting them on the flanks of my main line to create a crossfire with cavalry protecting them but this doesn't seem worth it with their range and vulnerability.
I don't like the idea of using onagers in field battles because of the difficulty that would be placed on the crew historically. Moving all those parts and setting it up in time for a field battle would not only be a logistical nightmare, but also impractical in the time allotted.
Instead of artillery I've been finding myself throwing in some extra velites/auxilia or extra cavalry because they are more reliable and produce more casualties with my style of strategy.
How do you guys use your arty, if you do at all?