In World War II, soldiers could dig trenches very quickly, why were they so fast?

Because the war is urgent, it must be dug quickly, otherwise the fighters will be damaged.

Because they are specially trained, and human lives are at stake, they must bring out their potential.

I think it's because they usually train more physically, so they have more strength and a larger number of people, so they can be very fast.

In November 1947 after the Battle of Jiaodong, Li Mi's integrated 8th Division was upgraded to the "Integrated Eighth Army", with two integrated divisions under its jurisdiction, and in August of the following year, it was upgraded to the 13th Corps, and the integrated division was restored to the corps number. Before the Huaihai Campaign, the 13th Corps was stationed in the area east of Xuzhou, because there were not so many soldiers in Xuzhou City, and at the same time, it was also to ensure the smooth flow of the Longhai line.

Li Mi has been dealing with Huaye on the Shandong battlefield for a long time, and he still has a lot of combat experience, especially during the battles of Nanma and Linyun, the entire 8th Division and Hu Lian's entire 11th Division were saved from being annihilated by relying on fortifications, so Li Mi did not dare to be careless in the construction of field fortifications. The headquarters of the corps is located in Nian Zhuangwei, located on the west bank of the Grand Canal in Jiangsu, on the north side of the Longhai Railway, the terrain is flat and there is no danger to defend, so Li Mi has no bottom in his heart, and the superintendent vigorously builds fortifications.

Due to frequent flooding, the houses and the entire foundation of the village were built slightly above the ground by 2 to 3 meters, which is called "Taizi" locally. The defense system of Li Mi's corps was based on these platforms, with the bunker groups built as the core, connected in all directions by trenches and communication ditches, and a large number of deer barricades set up in the open area, so that each "platform" formed an independent tactical support point, and several platforms were connected to form a relatively complete defense system.

Li Mi did take great pains to build bunker groups between villages to prevent our army from interspersing and dividing the villages after the battle began, which shows that this guy has accumulated considerable experience in the battle of Linyun, so the 13th Corps has been busy for more than three months. As a result, before Huaye's army moved south, Liu Zhi judged according to Zhongye's attack that our army might be trying to take Xuzhou, so he urgently ordered the 13th Corps to shrink to the city of Xuzhou, that is, Li Mi repaired the field fortifications for a long time and gave up without firing a shot.

However, it was appropriate to call out the Huang Baitao Seventh Corps, which was one of the reasons why the Yellow Corps dared to resist stubbornly in the corner of the village, because there were ready-made, complete and systematic fortifications. The Huaye pursuit columns ignored this point in the early stage of the campaign, believing that the Yellow Corps was just a retreating division, so after arriving at the Nian Zhuang battlefield, they tried to take advantage of the enemy's unstable foothold to quickly eliminate it, and the troops then fought and rushed violently, and as a result, the Seventh Corps relied on Zheng Xi's fortifications and American rapid-fire ** serious casualties, and the attack once failed, ** quite large.