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I agree that the part about shackles should be adjusted. Loading an autosave, dismissing troops, removing shackles, fighting again, etc. – this is quite a laborious, time-consuming, and tedious process. I think that shackles are a serious argument for the attacker to force the defender to fight. And there will be more possible developments: you gather archers to fly and attack with skeletons, forcing the opponent to pay a ransom, and he suddenly presents manacles! Moreover, when shackles work in battle, both players see it, which means the attacker can prove their presence in such a situation.