Zheng Yanwu field site is located at a large playground in front of Lu Xun Museum, Xiamen University. It is a Municipality Protected Historic Site. Before Zheng's Northern Expedition, ever chose and training privates. He trained the team with ten thousand of "iron man army", and later became the main to recover Taiwan. After liberation, in the Bajiao Pavilion Garden found a  "practice bravery" stone carvings of 120 cm long, wide 48 cm, now is existing in Gulangyu Zheng Chenggong Memorial Hall.