Moat construction

[xufu]

Xu Fu uses the Chang an Garrison to build a moat. Engineers quickly construct the layout. By accident and the diggers being much more efficient than the civilian haulers, a mound is created. This mound and moat obstacle while prove very ingenious by encircling the castle, offering it greater protection. By the time the moat is constructed it will be 40 feet wide and 60 feet from the castle walls. A 12 foot mound rises to fall 20 foot to the bottom of the moat. The gates and road are the only way to enter the castle. A caravan of carts arriving from the west bring barrels of fish oil it is drained into a reservoir and damned for the time. Wet cloth is made to cover the opening to the underground reservoir. The damn is built so that it will feed the moat its deadly fuel.

Edit: the first tier of damn is broken the moat begins to fill