Why a brilliant strategist executed his own protégé after a disastrous mountain retreat
In 228, the Shu Han chancellor Zhuge Liang launched a daring Northern Expedition against the state of Cao Wei. He entrusted the vital supply hub of Jieting to Ma Su, who ignored tactical orders to camp near water. His fatal decision to occupy high ground led to a crushing defeat.
The Battle of Jieting was a pivotal failure for Shu Han during the Three Kingdoms period. Zhuge Liang, the chancellor-regent, had orchestrated a complex campaign, using diversionary forces to lure Wei armies while he advanced toward Mount Qi. When Wei emperor Cao Rui personally moved to Chang'an to organize a counter-offensive under the general Zhang He, the strategic situation shifted rapidly. Zhuge Liang selected Ma Su as his vanguard commander, disregarding the counsel of veteran officers like Wei Yan.
Ma Su’s tactical error was rooted in a rigid adherence to military books rather than the reality of the terrain. Against explicit instructions to secure a city and maintain water access, Ma Su positioned his troops on a mountain. Zhang He exploited this vulnerability by encircling the hill and cutting off the water supply. While Wang Ping, Ma Su's subordinate, managed to organize a desperate retreat by using drums to simulate an ambush, the loss of Jieting crippled Shu Han's supply lines and forced a total withdrawal to Hanzhong.
The aftermath was a purge of the Shu military hierarchy. Zhuge Liang, despite his deep personal affection for Ma Su, felt compelled to execute him to maintain discipline and satisfy the public. This event became a cultural touchstone, immortalized in the proverb 'wiping away tears and executing Ma Su,' which signifies the necessity of impartial justice. While later literature and opera embellished the campaign—notably by inserting the rival Sima Yi into the narrative—the historical reality remains a sobering study of how a single tactical miscalculation can unravel an entire imperial campaign.
Source: Battle of Jieting
