The first few thousand lines are the environment I've created for my marksdwarfs and a little lower along is the actual problem, so don't feel bad about skipping a little...
I build a nice obsidian wall ( although only one level high ) to protect my fort entrance, and even used set up a drawbridge to stop invaders from getting over my moat, but stil lallowing trade.
Also, I have one drawbridge at the entrance to the mountain as an elaborate door, ready to block the actual fort entrance in case the ( dry ) moat, wall and raised drawbridge fail.
I built floor tiles on the top of the wall for my marksdwarfs, and even extended it to two tiles wide, and have simple up/down stairs at the ends of the wall to allow easy access to fortified positions. Fortifacations are placed on the top of the outer edge of the wall, for the entire length of the wall, aside from the spot where the bridge comes up.
Setting up a partol route on top of the wall, I eagerly set my squad on a test patrol to spot any potential invaders for the fort.
Here's where it got stupid...
Only one member of the squad patrols on top of the wall, and the rest of the squad mill about the wall entrance/drawbridge in a confused matter. They won't get up unto the fortified positions even if the patrol route passes through the "courtyard" and back up to the fortifications.
What am I excactly doing wrong with my patrols?