If you want to use a hidden military movement, follow the rules on Stealth.
Military movements that have not been posted here, or been sent to GMs as per the Stealth rules, are not considered valid for the game.When a player wishes to engage in stealth they contact a GM, explaining what they intend to do, what they’re using to do it, and how they’re going about it. The GM determines the level of success at achieving stealth, and this determines how much information the player must make publicly available; this can range from an utter failure, in which all information is made known, to a total success in which none is posted.