Zhang Xin rode out from the city and took his place within the battle formation.
The concept of military formations in ancient China dated back to the late Shang and early Zhou periods. When King Wu of Zhou launched his campaign against King Zhou of Shang, he deployed a rudimentary square formation—simple, rigid, yet effective. The Battle of Muye, recorded in the Records of the Grand Historian, preserves fragments of early battlefield doctrine: troops advanced in measured steps, pausing every few paces to maintain cohesion. After several assaults, they would halt and reorganize—discipline above all else.
In essence, formation took precedence over everything. Heads could fall, blood could flow—but the formation must never break. Any soldier who disobeyed orders to maintain alignment faced execution. Crude as it was, this "square formation" resembled little more than a large-scale drill exercise. Yet it was precisely this discipline that enabled the Zhou to overthrow the Shang.
Zhang Xin himself had once relied on this primitive method when he first faced Liu Bei, having known no better at the time. Even so, it demonstrated a timeless truth: in ancient warfare, formations were everything.
By the Spring and Autumn Period, formations had evolved. The original square was divided into three coordinated units—left, center, and right—giving rise to the term "three armies." These did not refer to troop types, but to battlefield positioning.
At the time, warfare remained straightforward: infantry formed the front line, chariots followed behind, and both sides charged head-on in a single, decisive clash. Victory depended largely on superior equipment and troop quality.
That changed with Duke Zhuang of Zheng. At the Battle of Xuge, he introduced the fish-scale formation, combining chariot assaults with coordinated infantry support from multiple directions—an early form of combined arms. He also restructured the three-army system, placing the left and right armies forward and the center behind, forming an inverted triangle. For the first time, formations gained depth.
The result was decisive—the Zhou forces collapsed in humiliation.
From that point on, military formations underwent rapid development. Various states introduced innovations, but among the most influential were the systems attributed to Sun Bin.
Contrary to popular belief, the famed Eight Formations were not mystical constructs. The "eight" referred not to eight distinct formations, but to eight operational units surrounding a central command. Structurally, it was a 3×3 grid—nine squares forming a single cohesive formation.
The central square housed the commander and remained stationary. The surrounding eight handled combat operations. The front, rear, left, and right units formed the main force, while the four diagonal units acted as mobile support, striking where needed. No matter where the enemy attacked, they would face pressure from multiple directions.
Later formations—such as the square, circular, wedge, and goose formations—were all derived from this foundational system.
At its core, all formations boiled down to two shapes: square for offense, circle for defense. No matter how complex they appeared, they were simply variations of these two principles.
Zhang Xin, having studied Huangfu Song's military treatise, now understood these concepts well.
His goal was not to destroy the enemy—but to delay them until reinforcements under Zhang Niujiao arrived.
So he chose defense.
His army of 1,800 infantry formed a modified circular formation based on the Eight Formations structure—nine units of 200 men each.
At the front stood Gao Shun, with Zhu Ling on the left and Yue Jin on the right. Together, they formed a semicircular frontline to minimize exposure. Shield-bearers knelt in front, while spearmen struck from behind.
The three central units were placed under Zhang Liao, acting as a flexible reserve to reinforce any point under pressure.
Zhang Xin positioned his own command at the rear center—an unconventional but deliberate choice.
Behind him, Dian Wei and Xu Huang guarded the flanks, ready to counter breakthroughs.
At the very back, cavalry under Zuo Bao and Yang Yi waited for the right moment to strike.
Once the formation was set, Zhang Xin ordered the troops to sit and conserve their strength.
He would not attack.
He would wait.
About fifteen minutes later, the Yellow Turban army advanced.
Over ten thousand men moved as one, their sheer numbers creating a suffocating sense of pressure.
Zhang Xin observed closely.
Xu He's recent training had yielded some improvement—but only barely. The enemy could now form a crude Eight Formations structure, yet their march remained disorganized. Every ten steps, they had to halt and realign.
Seeing this, Zhang Xin grew more confident.
The enemy halted three hundred paces away.
Xu He began final adjustments.
Zhang Xin glanced at the sun, then turned to Wang Ling.
"Send a messenger. Invite Xu He to speak."
The rider sped off.
Moments later, the message reached Xu He, who replied:
"Ask him—how many men will he bring?"
The question was relayed back.
Zhang Xin smiled faintly.
"Tell him this—I'll bring one man. He may bring as many as he likes."
Then he added casually,
"And tell the messenger… no need to hurry."
The rider nodded and set off again—this time at a deliberate, unhurried pace.