IIRC I actually faced something rather similar in multiplayer and won.
The one in multi player IIRC didnt have any onagers just half ele half cata
I made a square (2 ranks deep at front) from 15 Spartan hoplites and placed 3units of (cretin i think) archers and 2 onagers in there.
The onagers didnt really do anything notable if memory serves but the archers routed the eles (after the other player killed his cataphract geberal by charging my front with him) and the cataphracts destroyed themselves.
Of course this was a while ago and I may be remembering wrongly.
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