Hatcher's Notebook has been mentioned in several threads recently.
You can read or download it here:
The chapter on barrel obstructions starts on p.180, followed by a chapter on the strength of military actions on p.198.
Bruce
You can read or download it here:
Hatchers Notebook : Free Download, Borrow, and Streaming : Internet Archive
Hatchers Notebook
archive.org
The chapter on barrel obstructions starts on p.180, followed by a chapter on the strength of military actions on p.198.
Bruce