Antonid's force of 1,100 surprise attack did manage to be quite successful, putting quite a few bodies on the ground.
The legionaries were able to maintain their formation even in the rough terrain, while organized rows of crossbowmen from behind shot volleys that softened up their target, as the calvary on the wings, though unable to charge given the short distance and rough ground, were able to use their javelins as well as their higher position on the horses to stab and hack.
All this worked to spread great panic among the Tibians, who in the still slightly foggy weather struggled to truly comprehend the situation.
But unfortunately for Antonid, they did not panic enough.
At least not enough to break rank and run.
For one, Perseus had sent among the best of his men on this scouting mission, for he trusted their intelligence gathering skills the most.