The Battle of Tong Pass is a contest for a vital route in which Ma Chao’s forces first seize the pass and then rout Cao Cao’s army. Its central reversal comes when Cao Hong, initially blamed for a disastrous sortie, protects Cao Cao during the retreat; recognizing that his own decision to spare Cao Hong has preserved his life, Cao Cao rewards him. The episode makes the control of a narrow passage and the judgment of commanders decisive to the fortunes of the campaign.

Strategic Background

The contest follows the fall of Chang’an, which forces Cao Cao to abandon a southern campaign and concentrate on holding the pass. He sends a force of ten thousand under Cao Hong and Xu Huang to reinforce its defense. Ma Chao brings his troops below the pass and repeatedly challenges the defenders to come out. Cao Hong is eager to accept, but Xu Huang restrains him, recognizing the danger of abandoning a defensible position.

That caution holds until the ninth day, when Cao Hong sees Ma Chao’s troops resting. He descends with three thousand men and catches them by surprise, scattering them. The sortie seems to offer a chance to strike, but Xu Huang’s attempt to bring Cao Hong back into line cannot prevent the reversal that follows.

Ma Chao Seizes the Pass

As Xu Huang catches up with Cao Hong and calls for him to return, Ma Chao suddenly attacks. Pang De strikes from the other side. The two-sided assault breaks Cao Hong’s force: half his men are lost, Cao Hong escapes, and Pang De pursues him. The outcome is larger than the defeat of the sortie. With the defenders scattered, Ma Chao takes control of the pass.

Cao Hong and Xu Huang report the defeat to Cao Cao, who is furious and wants Cao Hong executed. Others dissuade him, and Cao Hong survives. The incident establishes how quickly a command decision can change the value of a subordinate: Cao Hong’s rash advance has helped lose the pass, but his survival will soon matter to Cao Cao in a different way.

Cao Cao’s Retreat and Cao Hong’s Defense

Cao Cao moves to the pass and camps below it, but the next day the Xiliang troops break the northern army almost immediately. Ma Chao and Pang De lead the charge, intent on capturing Cao Cao. As Cao Cao flees, his pursuers identify him first by his red robe, then by his long beard, and finally by his shortened beard. He casts away the robe, cuts his beard, and covers his face with a battle flag, but Ma Chao continues to gain on him.

Ma Chao’s spear nearly reaches Cao Cao, but strikes a tree instead. While Ma Chao struggles to free it, Cao Cao escapes. When Ma Chao catches up, Cao Hong is defending Cao Cao and holds him at bay until reinforcements arrive and Ma Chao withdraws. The man whose earlier action brought Cao Cao’s anger now prevents his capture. Cao Cao recognizes that executing Cao Hong would have left him to die and rewards him handsomely.

Consequences and Narrative Significance

The immediate result is Ma Chao’s control of the pass and Cao Cao’s retreat from the encounter. The narrative then shifts from open combat to the problem of what the terrain makes possible: Ma Chao has concentrated his troops at the pass, leaving the west bank of the Wei River undefended. Cao Cao and Xu Huang agree to send a force to seize that bank, cutting off Ma Chao’s retreat before attacking from the north. The battle’s aftermath thus arises directly from the geography that shaped its opening reversals.

The episode connects its large-scale contest for a route to smaller judgments about timing and loyalty. Xu Huang’s restraint and Cao Hong’s willingness to act pull in opposite directions; Cao Hong’s sortie helps Ma Chao seize the pass, yet Cao Hong’s later defense saves Cao Cao. The campaign does not make a single decision carry a single meaning: the same commander can be a source of danger in one moment and indispensable in the next. The narrow passage, the riverbank, and the exposed retreat give those reversals their strategic consequence.