Only 54 Cerberuses could be gathered so far. Maybe slightly increase the starting army size?
Even if the first attack is repelled, the second one results in a defeat.
On Recruit difficulty, it was possible to gather over 100 Cerberuses.
Does the map work normally, without any errors? And we can always simplify it if that's the problem. For now, I want to wait for feedback from experienced players who play on Veteran and Hero difficulties.