As your two armies were fighting over the course of an undetermined, but certainly very lengthy period of time, technology advanced to the point of the creation of nuclear missiles. After much careful discussion, the leaders of a certain country (here unnamed to protect its identity) agreed to intervene in your war and launch a nuclear missile against Post Praetorian.
Their move is NMx10mn, 9lm, 9no, P11lm, S8kl, P10ij, P11jk
Checkmate. Please note that in this case, there was no capture, but rather complete annihilation. Congratulations to the winning party and condolences to the remnants of the less fortunate army.