Cao Chun and his elder full brother, Cao Ren, were younger second cousins of Cao Cao. Their grandfather Cao Bao and father Cao Chi served in the government of the Eastern Han dynasty. Their father died when Cao Chun was 13 years old, so Cao Chun and Cao Ren lived with another family. They inherited their family fortune when they became older; they were wealthy and had hundreds of servants and retainers. Cao Chun was known for being a strict, rule-abiding and fair leader among his followers. His fellow townsfolk regarded him highly. A well-read man who respected scholars, Cao Chun was also popular among the literati, many of whom flocked to him and became his retainers. At the age of 17, Cao Chun was called to serve in the Han government as a Gentleman of the Yellow Gate. Two years later, he followed his second cousin, Cao Cao, to Xiangyi to recruit soldiers. Since then, he had fought on Cao Cao's side in several battles against rival warlords. He became a Consultant and Military Adviser to the Minister of Works sometime between 196 and 205. In early 205, he led the "Tiger and Leopard Cavalry" during the Battle of Nanpi against a rival warlord, Yuan Tan. When his forces suffered heavy casualties, Cao Cao wanted to call for a retreat, but Cao Chun stopped him and said, "We've travelled a long distance to attack the enemy. While we can't defeat them at the moment by advancing, we'll definitely lose our might if we retreat. Besides, we're already deep in enemy territory and we won't be able to last long. The enemy has become complacent after their initial victory against us; we've become fearful after our initial defeat by them. We can use our fear to overcome their complacency and defeat them." Cao Cao agreed and ordered his forces to press on their attack, and eventually defeated Yuan Tan. Cao Chun's "Tiger and Leopard Cavalry" killed Yuan Tan and cut off his head during the battle. In 207, Cao Chun led the "Tiger and Leopard Cavalry" again at the Battle of White Wolf Mountain against the Wuhuan tribes, who were allied with Cao Cao's rival Yuan Shang. During the battle, Cao Chun's unit captured Tadun, who was later executed by Zhang Liao, a general under Cao Cao. In recognition of Cao Chun's contributions in battle, Emperor Xian enfeoffed Cao Chun as the Marquis of Gaoling Village and gave him 300 taxable households to form his marquisate. In 208, Cao Chun accompanied Cao Cao on the campaign in Jing Province. During the Battle of Changban, Cao Chun led his troops in pursuit of the rival warlord Liu Bei and captured Liu Bei's two daughters, along with much of his equipment. They also rounded up some of Liu Bei's soldiers who were scattered during the battle and recruited them to join Cao Cao's forces. After Cao Cao occupied Jiangling County, Jing Province's capital, Cao Chun headed back to Qiao County. It is not known whether Cao Chun participated in the Battle of Red Cliffs. Cao Chun died in 210, the 15th year of the Jian'an era in the reign of Emperor Xian. In 220, Cao Cao's son and heir, Cao Pi, forced Emperor Xian to abdicate in his favour, ended the Eastern Han dynasty, and established the state of Cao Wei. After becoming emperor, Cao Pi awarded Cao Chun the posthumous title "Marquis Wei". The "Tiger and Leopard Cavalry" unit that Cao Chun led was an elite mounted unit in Cao Cao's forces. Its recruitment process was highly selective – only soldiers who had at least 100 men under them were eligible. Even Cao Cao himself found it difficult to lead such a unit, which was why he chose Cao Chun, who was able to gain the trust and respect of those elite soldiers. After Cao Chun's death, when someone asked Cao Cao to select a new candidate to replace Cao Chun, Cao Cao said, "Who is comparable to Chun? Am I not the only person capable of leading ?" He did not choose anyone.
Descendants
Cao Chun's son, Cao Yan, served as a military officer in the state of Cao Wei during the Three Kingdoms period and held the position of General Who Leads the Army. Sometime between 254 and 256, he was enfeoffed as the Marquis of Pingle District. After his death, his son, Cao Liang, inherited his marquis title.