When the Red Turban Rebellion broke out against the Mongol Yuan dynasty, the brothers led a group of local people into hiding in the mountains in 1351.

In 1360, he distinguished himself in battles against the troops of Chen Youliang, the emperor of the rebel state of Han who controlled the area around the middle course of the Yangtze River.

In 1367, as commissioner of the Central Military Commission and commander of the bodyguard, he played a key role in the arrest and trial of Zhang Chang, a former Yuan official accused of treason.

[1] In the 1368 campaign into northern China, which was still under the control of Yuan forces, he served under the command of Xu Da and Chang Yuchun.

[4] In March 1387, with an army of two hundred thousand soldiers, Feng Sheng led a campaign to the north of the Great Wall of China.

On 7 July, the Mongols defeated a separate division led by Zhen Yong (陣鏞), Marquis of Linjiang, and killed its commander.

Just seven days later, after crossing the Liao River, Feng Sheng caught up with Naghachu, defeated him, and brought him back to China as a captive.

[4] On the return march, the Mongols caused significant damage to the rear guard, resulting in the death of its commander, Pu Ying (濮英).

In 1393, he spent time at court with Fu Youde, possibly as witnesses to the execution of 20,000 people involved in Lan Yu's case.