Expert Analysis
Origins
Ma Su (190–228) was born in Yicheng, Jing Province, into a family of minor officials. His elder brother Ma Liang served Liu Bei as a strategist. Ma Su showed early talent in debate and military theory, earning a position as a staff officer under Zhuge Liang. He was known for his bookish knowledge but lacked practical battlefield experience.
Sun Li (fl. 230s–250s) was a member of the Sun clan of Wu, though not a direct descendant of Sun Jian. His early life is obscure, but he rose through military ranks during the reign of Sun Quan. He served in various commands along the Yangtze frontier, gaining experience in defensive warfare against Wei.
Rise to Power
Ma Su’s rise came through his association with Zhuge Liang. After Liu Bei’s death, Zhuge Liang relied on Ma Su for strategic advice. During the Southern Campaign (225), Ma Su proposed a policy of winning over the Nanman tribes through persuasion rather than force, a strategy that proved successful. This raised his profile, though he had never commanded troops independently.
Sun Li’s rise was more gradual. He first appears in records as a commander under Zhuge Ke during the Battle of Dongxing (252). Wei forces under Hu Zun attacked the newly built Dongxing levee. Sun Li commanded a section of the Wu defense and helped repel the assault, inflicting heavy casualties. This victory earned him recognition and promotion. He later supported Sun Jun’s coup against Zhuge Ke (253), providing military backing that secured Sun Jun’s control. As reward, Sun Li was appointed Governor of Jing Province, overseeing Wu’s western border.
Leadership & Governance
Ma Su’s leadership style was theoretical. He favored classic strategies but lacked the flexibility to adapt to real-time conditions. At Jieting, he disregarded Zhuge Liang’s orders to fortify the pass, instead deploying troops on a hilltop—a textbook tactic that failed when Zhang He cut off his water supply. His governance experience was limited to staff roles; he never administered a province or army independently.
Sun Li was a pragmatic commander. At Dongxing, he followed Zhuge Ke’s defensive plan, coordinating with other Wu generals to hold the levee. As Governor of Jing Province, he maintained stability through a combination of military deterrence and diplomatic engagement with local Wei defectors. He scored 57.1 in leadership (Military 40.0, Political 35.0) compared to Ma Su’s 35.4, reflecting his hands-on command.
Triumph & Tragedy
Ma Su’s greatest success was his strategic advice during the Southern Campaign, which helped Zhuge Liang pacify the Nanman without prolonged conflict. His greatest failure was the Battle of Jieting (228). Disobeying orders, he positioned his army on a hill without water access. Zhang He’s Wei forces surrounded and defeated him, causing the collapse of Zhuge Liang’s first Northern Expedition. Ma Su was executed at age 38, despite Zhuge Liang’s personal grief.
Sun Li’s triumph came at Dongxing (252), where he helped defeat a Wei invasion, killing thousands. His tragedy was his involvement in the coup against Zhuge Ke (253). While successful, the coup plunged Wu into political instability. Sun Li later disappears from records, possibly purged by Sun Jun’s successor Sun Chen. He never achieved major independent victories; his strategy score of 43.3 reflects competent but unremarkable performance.
Character & Destiny
Ma Su was overconfident in his theoretical knowledge. He ignored Zhuge Liang’s explicit orders and the advice of veteran officers like Wang Ping. His execution was a tragic consequence of his hubris. Zhuge Liang wept while ordering the execution, saying, “The law must be enforced.” Ma Su’s total score of 37.2 (Influence 45.5, Legacy 37.5) reflects his lasting infamy as a cautionary tale.
Sun Li was a loyalist to the Sun clan, but his support for Sun Jun’s coup showed ambition. He survived the turbulent politics of Wu by aligning with the winning side. His character was more cautious than Ma Su’s, which allowed him to die naturally (likely) rather than by execution. His total score of 41.9 (Leadership 57.1, Strategy 43.3) places him above Ma Su, but his legacy is obscure.
Legacy
Ma Su is remembered primarily for his catastrophic failure. The phrase “Ma Su loses Jieting” became a Chinese idiom for incompetence. His story is used to illustrate the importance of obeying orders and the dangers of theoretical arrogance. Zhuge Liang’s execution of his friend also set a precedent for strict military discipline.
Sun Li is a footnote in Three Kingdoms history. His involvement in the Dongxing victory and the Zhuge Ke coup are mentioned in the Records of the Three Kingdoms, but he had no lasting impact on Wu’s governance or military doctrine. His legacy score of 35.8 is among the lowest for a general of his rank.
Conclusion
Sun Li had a higher total score (41.9 vs. 37.2) and a better military record. He won a significant defensive battle and rose to high office. Ma Su’s single failure destroyed an entire campaign and overshadowed his earlier contributions. However, Ma Su’s influence (45.5) and legacy (37.5) surpass Sun Li’s (43.2 and 35.8) because his story became a cultural lesson. In terms of direct impact on their respective states, Sun Li contributed more positively. But Ma Su’s cautionary tale has greater historical resonance. The data supports Sun Li as the more effective commander, but Ma Su’s legacy is more enduring.