In the twenty-first year of Yuan Zhizheng (1361), Zhu Yuanzhang attacked Chen Youliang on a large scale. Captured Leping first. Then, Zhu Yuanzhang ordered Xu Da and Chang Yuchun to be the vanguards, and he arrived in Anqing by taking the Longxiang giant ship. After fierce fighting, Anqing was occupied.
When Chen Youliang entered Qilong Bay, Chang Yuchun set up an ambush with five armies, defeated Chen Youliang's army, and finally recovered Taiping Mansion. **Highest in spring. After Zhu Yuanzhang occupied Anqing, he pursued Chen Youliang to Jiangzhou, and ordered Chang Yuchun to stay in Taiping Mansion. Chang Yuchun is used strictly, and the army and civilians are respectful and do not dare to violate it. So he was promoted to the governor of the province. Later, Chang Yuchun also guarded Longwan, supported Changxing, captured and killed more than 5,000 Zhang Shicheng's soldiers, and Zhang Shicheng's subordinate Li Bosheng withdrew from the siege and fled. Chang Yuchun was ordered to build Anqing City.
In the twenty-third year of Yuan Zhizheng (1363), Chang Yuchun cooperated with Xu Da to besiege Luzhou. When Luzhou was about to be captured, Chen Youliang took the opportunity to besiege Hongdu (now Nanchang, Jiangxi). Zhu Yuanzhang led 200,000 sailors to support, and Chang Yuchun followed. A fierce battle took place at Kanglang Mountain in Poyang Lake. In the battle, Chang Yuchun took the lead bravely, and under his influence, the soldiers all took one as ten and one as a hundred. The shouts of killing shook the heavens and the earth. The fierce battle was in full swing, and suddenly Chen Youliang's Xiao drove Zhang Dingbian to Zhu Yuanzhang's boat, and his people were extremely brave, and more than a dozen people couldn't resist it. At this critical moment, the ship that often meets spring flies in. At this time, Zhang Dingbian had knocked Zhu Yuanzhang's guards into the water one after another, and jumped onto Zhu Yuanzhang's warship, and Zhu Yuanzhang had already pulled out his sword and fought with Zhang Dingbian's soldiers. Chang Yuchun saw that it was too late to row in, so he opened his bow and arrow, and shot an arrow according to Zhang Dingbian, and an arrow was in the crotch behind Zhang Dingbian. Zhang Dingbian was raising his knife to cut Zhu Yuanzhang, but this time, with a "plop", he fell into the water from the boat, and Zhu Yuanzhang and his remaining two guards also killed the remaining soldiers. Only then did Zhu Yuanzhang save the day.
The battle ended with Zhu Yuanzhang's decisive victory. After the victory of the troops, they were rewarded and often ranked first in the spring merit, and were rewarded with rich money, silk and land.