In the spring of 1949, a war is about to happen between the Liberation Army and Kuomintang Army on the Yangtze River. The Liberation Army dispatches a reconnaissance to scout the southern parts of the River, whose work is actually full of hardships and dangers. However, with the help of the local crowd and the guerrillas, finally, the members of the reconnaissance succeed in the commission and offer valuable information to the Liberation Army, making great contributions in the war.

Before the liberation of Shanghai, Nationalist agent Zhang Rong is ordered to blend in with the captive workers of the Baotong Mill and wait for a chance to act. After the liberation, he returns to the factory, disguising himself as a far-left agitator and causing friction between the workers and management.

After graduating from maritime college, a group of girls arrive to undergo practical training on a ship and, as future navigators, are greeted in different ways.

Steelworker Ding Da-gan suffered severe burns in an accident. The victim's condition was almost hopeless, but people from all over the country rallied to save Ding Da-gan's life, and death receded.

The Min River is crucial for Fujian Province’s economy. In 1947, Lin Sen Guan, a Communist Party member and driver of the “Fuzhou” steamship, smuggled weapons and radios to a guerrilla base with fellow party members. The enemy, led by transportation inspector Wang Xun, sent spy Li Boguang to monitor them. Lin Sen Guan tricked Li Boguang, but the spy later discovered the weapons. Lin Sen Guan pushed him into the water, witnessed by helmsman A Wang, who refused to reveal the truth despite enemy pressure. The underground party decided to transport remaining weapons to the guerrilla zone. The “Fuzhou” set sail, followed by enemy ships. Near Luohan Tan, a guerrilla team unloaded the weapons. The enemy opened fire, but A Wang steered the “Minh River” into an enemy vessel, causing mutual destruction. The weapons reached the guerrilla zone, and Lin Sen Guan continued their underground efforts.