・FORTIFYING THE REAR OF A CASTLE: Methods in protecting the vicinity of the castle when an effective barrier cannot be established.
① Sō no Kaku Umadashi (草ノ角馬出シ)
A barricade in front of the main gate. It is strategically designed in accordance with the front of the castle to prevent oncoming enemies from having any point of advantageous cover.
② #3 (三)
The third compound of the castle housing troops and battlefield weapons. This will be the 1st location the enemy army would have to traverse through. Since the rear of the castle is cut off from land attacks due to its natural protection by the sea, there is only one of these needed. This is short for “san no maru” (三の丸).
③ #2 (二)
The second compound of the castle. These 2 areas act as an added layer to traverse through in order to get to the main compound. This is short for “ni no maru” (二の丸).
④ Sai-shutsunyū (再出入)
A reusable entrance for the castle dwellers. Possibly a means to escape, or to slip out unnoticed when necessary.
⑤ Honmaru (本丸)
The main compound of the castle.
⑥ Yokoyari hei Kazedake (横矢屏風竹)
A grove of bamboo used as a fence to protect against enemy long-range assault (arrows, gunfire, etc.)
⑦ Tsuji Umadashi (辻馬出)
A barrier or blockade at the side of the castle. There is no indication as to the design or size of this.
⑧ Umi (海)
This is the sea, and possibly also referring to a large body of water. The idea is to build a castle with its back to water, making it difficult for enemy troops to storm through the back. This covers from the rear all the way to most of the eastern side of the castle.
*NOTE* The following diagram is a duplicate of the original used for the translation project, reproduced by hand. The design and information are the same, but the numbering order has changed to fit with its current presentation.