At that time, the oil production and chemical industry in the world were not as developed as today, and cheap textiles such as polyester were mass-produced only after the founding of the People's Republic of China. Sacks belong to hemp products, and their weaving belongs to folk hemp, which is made into bags after spinning. In addition to being put into the sand to make a small fortress, sacks can also be put on the body to avoid bombing by Japanese planes. In addition, sacks were a substitute for those who lacked medical care and medicine in those days to keep out the cold. In the drama "My Head and My Regiment", there is a scene in which Yu Xiaoqing encourages the Sichuan Legion to go to Myanmar. In case of heavy rain on the way, the only sack was given to the wounded to keep out the cold.
At that time, it was difficult to buy sacks in the market, and the national salvation group in Beiping donated 10 thousand sacks. The students went door to door to encourage people to donate sacks. Many people always have sacks, and the donated sacks are as high as mountains in less than a month.
The sack donation movement ignited the people's anti-Japanese sentiment, and the establishment of various condolence teams made the soldiers feel the feeling of unity. However, some waverers and fence-sitters in the local government stopped people from collecting sacks for fear of bad influence.
In the Battle of Songhu, the Battle of Nanjing and the Battle of Taierzhuang, sacks played a greater role. Because the output of cement concrete in China is less, the ring fortifications can only be built with sandbags. On the other hand, at the beginning of the Battle of Songhu, why Japan was able to hold all key positions with less troops in various places was because they had very strong reinforced concrete tools. When the same bullet hits, Japan's naval command and other fortifications can bounce off the bullet and reduce the lethality of shrapnel. There is a circular position made of sacks in the battle of Songhu.
Although the sacks are small, China people never complain in the face of the war of resistance. It is also an important reason why China can persist in the Anti-Japanese War 14 years with its weak agricultural national strength.
In the Battle of Taierzhuang, the people around Xuzhou automatically took part in the work of lifting wounded soldiers and acting as guides. Many people took the guns directly from the wounded soldiers and rushed to the front. Outside the city wall lay the body of a 50-year-old woman whose leg was blown off. In fact, this old lady is an unknown martyr on the anti-Japanese battlefield. Teacher Chi Fengcheng said that the old lady often braved bullets to send news from Japan and brought some rice. Later, when I found out, I blew it up with a Grenade. The Chinese nation can stand for 5,000 years, thanks to these lovely China people and the respectable Chinese soul.