it took me ages, use one yari and the heavy cavs to kill the muskets, move the archers away from the castle and shootas much of the heavy cav behind them as you can, whilst marching all your yari to keep that cav busy, now move the Nd away from the castle but keep them seperate from each ohtre. THe trick is to draw the kensai and monks out of the castle, then rush it with all your cav. Eventually it'll work htough it might take a few goes to perfect

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Oderint dum metuant