The story mainly tells the story of the Pingshan Regiment, which was composed of countless children of Hutuo in Yanzhao. The Pingshan Regiment, which had made many military achievements, was praised by Nie Rongzhen, the commander of the Jin-Cha-Ji Military Region, as the iron-clad children of the Taihang Mountains! Later, the Pingshan Regiment returned to Yan'an with the 359th Brigade and opened up wasteland for production and self-reliance in Nanniwan, which strongly supported the anti-Japanese war in the border area.