sorry, but providing maps for online games has never been my forte. I've no scanner, can't download any of those specialty map making programs, and don't like trying to use paint for it, so I'm afraid description and imagination are all we've got.
You're not sure how long you'll have, but they'll be on your heels for the last half mile. I'm gonna be randomly determining how far behind you they are when you guys are 1 minute away. At that point, there's actually a small chance they'll catch up to you BEFORE you make the tree-line.
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OK, I figure better when i type something, so here's how I figure their distance.
At your slowest, you double-move 60, and during the last minute you'll RUN flat-out, b/c they'll be gaining, so that's 120.
They'll do the same, running at 200 on their wolves.
SO, when you guys are 1200' away, They'll be 4d6X100 feet behind you(~1400 AVG). They gain 80/round in the last minute it takes you to get to the fort, so it could vary anywhere from them catching you 600' from the fortress to them being 1600' away when you get inside. Either way, it'll be fairly close. (Basically If I roll 8 or less on the 4d6, they catch you outside. Otherwise they don't).
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And as for the posting rate.. well, it's fairly PC-driven for the most part, so that's up to you guys. I can do stuff to 'prod' you along occasionally.