there was a post on /int/ by a hungarian from a village near border. he was on foot walking for like 3 days and 2 nights to get to hungary.   and he knew the paths, the region, the language when he arrived, had experience camping, had a bag with food and stuff, was fit, etc.  still the talk about bloody toenails and feet and hiding until dark to get across border and the failure with orientation and hunger.. its not a pleasant read or a thing to imagine.  can be found on desu archive.
Serbia