Following someone's guide, I managed to get "Crusader Kings 2" using this "order 66" tactic to capitulate France quickly, hold vs. Belgium, and collapse Britain by taking what they abandoned [not much else one can do with mere rifle brigades vs. full, fully supported divisions on their home turf]. It worked beautifully. I also used this tactic vs. the USA to take Washington ["1812 Again" or something like that] but not by occupying their VPs - I just parked on my side, waited for the US to deploy overseas, and then proceeded vs. divisions that were low org due to using strategic redeployment. Its a powerful strategy if executed properly, but would never work against a human player, and can backfire.
One thing to watch for is when leaving a faction prior to declaring war, units that can redeploy home [or to friendly turf] will do so if there is a land-based or strait-based path. Units separated by oceans or borders that cannot be crossed will just sit tight. This will go on for a few days, so if you have to wait before declaring war, be aware of this. I found it useful to put all such units under one FM so that I could select the entire force, regardless of which continent they were on [they were in France, Malaya and India] and mash the "H" key to keep them in place until the units gave up on redeploying home.
