This is true. But what i'm after is this happening without the spy. Or (in conjunction with the spy) the strength of the invading army (if substatially more than the defending one) increasing the % of success of the spy. At the momement it is based on the spy's skill alone.
I was picturing a town, with say one or two units defending it, besieged by a large army. The chance of success for the defenders is minimal so in order to not anger the soon to be conquerors someone betrays the defence. of course you may still choose to exterminiate the populace afterwards if you wish

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