Mozi

The Canon of Fortification and Universal Love: Mozi (墨子)

The Ancient Philosophical Doctrine, Anti-Aggression, and the World’s Oldest Treatise on Siege Defense

In the sweeping geopolitical struggles of ancient China and the martial tapestry of Luo Guanzhong’s (罗贯中, La Quán Trung) immortal epic Romance of the Three Kingdoms (三国演义, Sān Guó Yǎn Yì, Tam Quốc Diễn Nghĩa), supreme strategy encompassed not only decisive cavalry charges and aggressive blitzes, but also the formidable, indomitable science of fortress defense. Standing as one of the greatest intellectual monuments of the Hundred Schools of Thought (百家争鸣), the Mozi (墨子, Mòzǐ, Mặc Tử) is the foundational canon of Mohism (墨家, Mòjiā), celebrated across millennia as ancient history’s most sophisticated manual of civil defense, defensive engineering, and moral statecraft.

Mozi (墨子, Mặc Tử) — The Supreme Treatise on Siege Defense and Universal Love

“To condemn offensive war is not merely to preach peace; it is to master the supreme art of fortification so that aggression yields only ruin. When defense is impenetrable, benevolence and righteousness prevail under heaven.”

(兼相爱，交相利；知止足，绝非攻。 — 《墨子·兼爱/非攻》)

Far from advocating passive pacifism, the Mohist tradition was fiercely militant in the protection of the innocent. Master Mo and his disciplined disciples were legendary combat engineers who marched thousands of li to aid small, besieged states against mighty imperial aggressors, proving that ethical compassion without military fortification is hollow.

1. Etymology and Historical Identity

The title and philosophical origin of this monumental work encompass profound social ethics and artisan brilliance:

• Mòzǐ (墨子): Translates to “Master Mo” (Mặc Tử). Honoring Mo Di (墨翟, Mò Dí, Mặc Địch, c. 470–c. 391 BC), a brilliant philosopher, engineer, and logician born in the State of Lu or Song who lived during the Warring States period.
• Mòjiā (墨家): The Mohist School of Thought, one of the two preeminent philosophical traditions alongside early Confucianism in pre-Qin China. Mohists were organized into disciplined fraternities of scholar-engineers (Juzi, 钜子) pledged to rigorous austerity and selfless mutual protection.
• Bīngfǎ & Shǒuchéng (兵法与守城): While the earlier chapters expound social philosophy, the concluding eleven chapters constitute China’s earliest and most detailed compendium of military engineering, tactical counter-measures, and urban fortress defense.

2. Core Philosophy: Universal Love (兼爱) and Anti-Aggression (非攻)

At the center of Mohist doctrine lie two interdependent pillars:

1. Universal Love (兼爱, Jiān’ài): The belief that all human beings under Heaven deserve impartial care and dignity, regardless of kinship, clan, or national borders. Mozi argued that warfare and civil slaughter arise when men value their own families and kingdoms while dehumanizing those of others.
2. Condemning Offensive War (非攻, Fēigōng): A sharp condemnation of wars of conquest waged by predatory warlords for territory and vanity. Mozi mathematically demonstrated that aggressive invasions destroy the common folk, bankrupt treasury reserves, and invite internal rebellion.

The Legendary Duel of Wits: Mozi vs. Gongshu Ban

In one of the most famous episodes recorded in early Chinese chronicles, the superpower state of Chu planned to crush the small state of Song using revolutionary siege ladders (云梯) engineered by the legendary artisan Gongshu Ban (公输班 / Lu Ban). Mozi traveled on foot for ten days and nights to the Chu capital to halt the invasion.

Before the King of Chu, Mozi untied his sash and laid it out on the palace floor to represent the city wall of Song, using small wooden chips to symbolize defensive engines. Gongshu Ban repeatedly deployed nine distinct siege tactics—scaling ladders, battering rams, and flanking assaults—yet Mozi repelled every single offensive maneuver with nine ingenious counter-defenses. When Gongshu Ban ran out of inventions and subtly hinted that he could simply assassinate Mozi, Master Mo calmly revealed that three hundred of his disciples were already stationed upon the battlements of Song, armed with his defensive machines and awaiting the Chu army. The King of Chu immediately called off the invasion without shedding a single drop of blood.

3. The Manual of Siege Warfare and Fortress Defense

The military chapters of Mozi comprise the most exhaustive ancient guide to urban defensive warfare in world literature, systematically detailing counter-tactics against every form of siegecraft:

• Defending the City Gates (备城门, Bèichéngmén): Engineering double-gated barbicans, rolling fire-logs, and iron drop-gates (portcullises) to annihilate enemies who breach the outer portal.
• Countering Siege Towers (备高临, Bèigāolín): Constructing elevated wooden parapets, ballistas, and stone-projecting trebuchets to target enemy archers perched atop mobile wooden towers.
• Countering Scaling Ladders (备梯, Bèitī): Deploying iron rake-poles (推钩) to topple ladders backwards, combined with pots of boiling pitch, sulfur, and burning caltrops dropped onto ascending soldiers.
• Countering Sapping and Tunnels (备穴, Bèixué): Burying massive ceramic resonance urns (瓮) underground along the perimeter to detect the acoustic vibrations of subterranean digging. Once an enemy tunnel was located, Mohist defenders dug intersecting counter-shafts and used leather bellows to pump toxic smoke and burning charcoal into the tunnel, suffocating the sappers.
• Countering Inundation (备水, Bèishuǐ): Building diversion canals, sluice gates, and water-resistant clay ramparts to neutralize enemy attempts to drown a fortified city.

4. Resonance in the Three Kingdoms Era

During the brutal sieges of the Three Kingdoms era, commanders who mastered the deep defensive doctrines of Mozi repeatedly thwarted overwhelming enemy armies:

• Hao Zhao (郝昭, Hác Chiêu) at the Siege of Chencang (228 AD): The ultimate embodiment of Mohist fortress defense. Stationed with merely 1,000 defenders at Chencang, Hao Zhao resisted Zhuge Liang‘s 100,000-strong northern expedition army for over twenty days. When Shu deployed scaling ladders, Hao Zhao burned them with flaming arrows; when battering rams struck the gates, he shattered them with rolling millstones; when Shu sappers dug underground tunnels, Hao Zhao dug inner defensive moats to collapse them, forcing Zhuge Liang into a legendary withdrawal.
• Man Chong (满宠, Mãn Nùng) at Hefei New Castle: Recognizing that old fortifications were vulnerable to waterborne naval superiority from Eastern Wu, Man Chong relocated and fortified the new castle inland, incorporating Mohist perimeter traps, burning towers, and concentric kill zones that repulsed Sun Quan‘s repeated invasions.
• Sima Yi (司马懿, Tư Mã Ý): Sima Yi’s fortified trench warfare across the Wei River and at Wuzhang Plains prioritized defensive attrition, completely neutralizing Shu’s offensive offensive initiative.

Summary of Profile Details

Comparative Strategic Philosophy: Mozi vs. Sun Tzu

While Sun Tzu’s The Art of War revolves around tactical deception, mobility, and offensive speed, Mozi provides the essential ethical counterbalance to warfare: teaching commanders that real strength lies in protecting the homeland, fortifying communities, and ensuring that no aggressor can profit from unjust violence.

To explore more legendary tomes, sacred scrolls, and imperial relics, visit the Famous Items Collection or read the Three Strategies of Huang Shigong.