Diagram of the Four-Corner Formation of the Miscellaneous Military Schools

This diagram, likely sourced from the Ming Dynasty encyclopedia Wu Bei Zhi (Treatise on Armament Technology), depicts a sophisticated tactical layout. The Zabingjia (Miscellaneous Military Schools) were known for synthesizing various classical theories into practical, adaptable formations. This specific diagram focuses on the "Four Corners" (隅 - yú), which bridge the gaps between the four cardinal directions (Front, Rear, Left, Right).

FRONT

Front Main Balance Line | Regular Force | Surprise Force

original: 前衡 (qián héng), 正 (zhèng), 奇 (qí). The "Main Balance Line" acts as the anchor of the front. The "Regular" force engages the enemy head-on, while the "Surprise" force is reserved for unorthodox maneuvers.

FRONT-LEFT CORNER (Northwest)

original: 前隅 — qián yú

RIGHT CORNER (Northeast)

original: 右隅 — yòu yú

LEFT

Left Main Balance Line | Regular Force | Surprise Force

original: 左衡, 正, 奇

RIGHT

Right Main Balance Line | Regular Force | Surprise Force

original: 右衡, 正, 奇

LEFT CORNER (Southwest)

original: 左隅 — zuǒ yú

REAR CORNER (Southeast)

original: 後隅 — hòu yú

REAR

Rear Main Balance Line | Regular Force | Surprise Force

original: 後衡, 正, 奇

Tactical Definitions

Miscellaneous Military Schools original: 雜兵家 — Zábīngjiā. A term used to describe military strategists who did not follow a single school of thought (like Sun Tzu) but instead combined various techniques—from formations and weaponry to divination and logistics—into comprehensive manuals.

Four-Corner Formation original: 四隅陣 — Sìyú zhèn. A defensive and offensive structure where the "corners" (the diagonals) are manned to prevent the army from being outflanked. In traditional Chinese cosmology, these corners also represent the "Four Gates" that complement the cardinal "Four Squares."

Regular and Surprise original: 正奇 — zhèng qí. A foundational concept in Chinese warfare. Zhèng (Regular/Orthodox) forces fix the enemy in place, while Qí (Surprise/Extraordinary) forces deliver the decisive, unexpected blow.

Main Balance Line original: 衡 — héng. Literally "the beam of a scale." In a formation, it refers to the horizontal line or the "weight" of the unit that maintains its balance and integrity against enemy pressure.