In the autumn of 1950, the new China was full of new things. Wu Qianli, the captain of the 7th Reconnaissance Company of a certain army, returned to his hometown to visit his relatives. The eldest brother of the Wu family died in the Huaihai Campaign, and the third brother, Wu Wanli, was naughty and undisciplined, causing trouble to the neighbors in the fishing village. Qianli decided to take him to the right path to join the army. When the brothers returned to the camp, they just caught up with the army to set out to the battlefield to resist the US and aid Korea. Wanli had just arrived and met a group of veterans who had been on the battlefield for a long time. They were all tough and true. After crossing the Yalu River, it happened to be the coldest winter in Korea for a hundred years. The regiment ordered to break up into small groups and lurk deep behind enemy lines. The new recruit Wanli first entered the battlefield and became a burden to the 7th Company. Wanli and the 7th Company grew up together in a series of hard battles. In the airport battle, the 7th Company saw through the US military's tricks and saved the entire corps, but was separated from the main force. They searched for the main force to the Watergate Bridge. The Watergate Bridge was a weight that could influence the situation in the Korean War. The 7th Company, with only more than 30 people left, had to complete the task of bombing the bridge. The "Steel 7th Company" accomplished this feat that will go down in history with great sacrifice and strong revolutionary will. Qianli sacrificed his life, while Wanli grew up to be a responsible soldier. He will spend the rest of his life fulfilling his promise to his brother and rebuilding the "Steel 7th Company".