Help With Horde Creeping

I'm working on a horde of Zombies that walk very slowly toward the nearest character. I'm thinking of saving time by putting their movement on the same initiative and doing it all at once. I don't know anything about API, so please help if you can. What I need: A command that causes all tokens with a given name to move exactly 1 unit toward a particular token id. For example: !crawl ?{horde token name} toward ?{target id} Is this easy enough that somebody could write it up?

That's with no regard for terrain?

Ooooohhhh! Walking Dead scenarios!

Aaron: I would like regard for terrain, but I thought I'd be more likely to get a response if I made it easier. If anybody could make it regard terrain, for example by avoiding a certain token_name on the map layer, that would be really cool. Otherwise I can fix disregard for terrain manually.

That makes it somewhat more complicated, but also much more interesting.. I need to finish up that other script I've already promised you, but I'd love to write this one. =D