Treatise on Military Preparedness (Vol. 98)

...li. Along the northern bank, it begins at West Liang Mountain and extends down to Huangtiandang, totaling 240 li. There are 94 combat vessels, including patrol, sand, iron, and shuttle boats, with over 1,300 officers and soldiers divided into 10 patrols. Each is assigned a defensive position. The upper patrol meets with the officers and soldiers of the Digang bazong, and the lower patrol meets with the officers and soldiers of the Yizhen garrison and the Tushan bazong.

Defensive Position of the Yizhen Garrison

Along the northern bank, it begins at Huangtiandang and extends down to Guazhou, totaling 140 li. There are 37 combat vessels, including patrol, grass-cutting, and shuttle boats, with 455 officers and soldiers. The upper patrol meets with the officers and soldiers of the roving troop battalion bazong, and the lower patrol meets with the third...