Okay I know Bull Run is a river where battles took place during the Civil War, the first Battle of Bull Run, the confederates won and it was the 2nd Battle of the war. I named it this not because I think it resembles this river at all, but because it seemed like a good name, and it stuck out to me.
this takes a lot of pieces that I just threw together throughout the pieces in my collection, so you can probably substitute many of the pieces for other pieces of yours if you lack pieces or whatever.
This is what it takes, it's not to the max, not all of the pieces from these sets.
2x Rotv
1x Sotm
2x TJ (trees so yeah you kinda need these)
various tiles from expansions or whatever you need to finish it.
I haven't playtested it but it looks pretty cool, and I think it could be fun.