You creep along slowly. When you are about half way to the western wall of the manor you notice one of the Orc guards heading toward the depression. He seems to be mildly curious but not alarmed.
I wait until I am absolutely sure he is not coming back, and then I squirm toward the manor as fast as I can, no longer worrying about getting dirt on my clothes when the alternative is blood!
The depression ends at the base of the wall. Who ever is in front will notice that while all of the windows have heavy iron bars on them, the window above the depression (created by runoff from the roof of the manor) is very rusty and only hanging on by one corner.