If I remember my history correctly Romans were made to walk "under the yoke" after defeats against Numantia and again versus Jugurtha. The deal being they got to live and that the proconsul would recognise the other side's right to exist. It would be an amazing feature of EB II if releasing prisoners effectively forced the AI sign a peace deal.
Although of course like rl Romans it would assuredly ignore the terms of any treaty and attack again in the near future.
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