I made a quick map to show what the battlefield will look like
° Brown soil is relatively flat ground
° mossy rock are rocky outcroppings and uneven terrain, good place to hide in or stand on but difficult to manouver through.
° clean rock are the borders of the pass and can be considered impassable.
My force will start on the left, yours on the right. Is this ok with you?

[img]http://oi64.tinypic.com/1602453.jpg[/img]