The Sixth Bid Section Project of Laiwu Tai'an Section of Qinglan Expressway of China Railway Fourth Engineering Group Co., Ltd. was started last September. Due to the adjustment of the construction scheme, the construction period was reduced to 16 months. In order to ensure the 24-hour non-stop operation on the construction site and fully mobilize the enthusiasm of the team and workers to work at night, on September 1, the secretary of the Party branch of the Project Department formulated measures to send midnight snack for the on-site workers. As the midnight snack delivery was deeply loved and appreciated by migrant workers, migrant workers affectionately called them "cavalry gang" on the construction site.