So, I'm writing a fanfiction; I don't know if this is a shunned topic here, but I'm asking anyway. In this fanfiction, a human finds himself in the Redwall universe, equipped only with a duffel bag containing an undefined set of "survival supplies and small valuables", salvaged from his car after it was submerged. He meets a tribe of semi-nomadic shrews, oppressed by more developed societies, and enacts a movement to take back their native land, using some of his tech know-how from our world in his effort. My grand plan involves him, over the course of his remaining lifetime, bringing about such an enormous burst of technological development that the continent where he introduces these changes is cordoned off by pseudo-divine powers-that-be blah blah blah.
You didn't come here to read that; you came for the question. I've read a few answers here and articles elsewhere that provide some moderately helpful answers, but all of them rely on the world being ours. The problem with Redwall's universe is in the inherent differences between a single, united human species and a whole host of competing species of varying intelligence. Without the presence of work animals such as horses and bulls, agriculture would not develop anywhere near how it developed in our world; without any sort of consistency between soldiers, the military situation would look like a medieval version of the Jenkinsverse. Originally, I wondered whether it would be possible for someone from modern-day Earth, equipped only with a duffel bag of necessities, to fast-track a civilization from nomadic foragers into an industrial age; now, my only question is, could he get anywhere at all?
EDIT: According to the comments, I haven't done enough to define the setting. The world is populated by a variety of different creatures, mostly rodents and mustelids. For the most part, carnivorous species are painted as villainous and herbivores and insectivores as good; this is broken in the cases of badgers and otters who are universally good creatures in the setting. Very few, if any, of the creatures shown are actually carnivorous; they may be cannibalistic, but this is treated with the same stigma as in the real world, and doesn't actually seem to be necessary. The technology level of the setting varies between hunter-gatherer and Iron Age; a few castles and fortresses exist in various locations, but they are easily outnumbered by various nomadic groups. An abandoned lumber mill is shown in one episode of the TV show, one character makes a passing mention of a 'machine' in a metaphorical sense, and another character is inexplicably able to build ballistae. Other than these instances, the setting is generally in a perpetual medieval stasis (are TVTropes links allowed?). The only technological "development" shown is a ship in the most recent book that is outfitted with cart wheels, so that it is allowed to sail on land. Little consideration is given as to the ramifications of this, especially since the wheels don't appear to have any sort of suspension.
You might be able to get more out of the wiki, but not much. I'm only linking the Places page because I get the impression that architecture may give the best picture of the technology level, out of the pages available.