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I just started playing the game recently and one thing I do not quite understand yet is how military access works. In times of peace, you need military access to move your troops and dock your ships in foreign territory. In war time, you can usually move your troops across foreign territory without acquiring permission first. Why is this so? And lastly, sometimes when you are at war, you are able to move your troops across foreign territory but then suddenly you can't anymore. Why is this so?

As what country are you playing?

Prussia

Are you a member of the HRE?

Not a member.

This thread may help you out.

If the guy you are moving troops through is a vassal of the guy you are at war with, you automatically get the ability to move troops through their territory.