A Stockade
palisade
they built it out of heavy stones and logs
it was made of logs
4 logs
It is call a "deadfall"
Heavy Wall pipe refers to a steel pipe has a wall thickness of relatively thick. by SunnySteel.com
10
cheese
You possibly mean a MAUL hammer. This is a large heavy hammer, often of 4-8 pounds weight. There is a flat striking face one side and generally a small axe on the opposite side. It's used for pounding spikes and stakes and for splitting logs.
It is on the passenger side of the engine on the bottom/ low side just in front of the fire wall. Just track the heavy ground wire off the battery negative side and it will lead you right to it.
On the east side, it was forbidden to go on the side of the street the Wall was on. (The Wall was on Mauerstrasse - "wall street." It's still named that.) The west side didn't have that problem.