On this day, 109 years ago, on September 15, 1916 (August 18, 1916 lunar calendar), tanks were used for the first time in the "First World War". Tanks were first used as a branch of warfare. In 1916, the First World War entered the decisive stage. In 1915, the German army achieved great victories on the Eastern Front, but did not achieve the goal of subduing Russia. In 1916, the German army adjusted its deployment and decided to focus on the Western Front. It intended to defeat France, the main force on the Western Front, first. If Britain and France failed, Russia would lose Western financial and military support. Therefore, the battle on the Western Front was more intense than ever. On September 15, 1916, British and German troops were engaged in artillery battles on the battlefield on the Somme River in France. Suddenly, from the British position, an iron box-like behemoth came out and charged towards the German position, as if nothing could stop it. And while rushing, the guns were fired "thump thump thump". The Germans hurriedly fired at it. Strangely, this thing was actually invulnerable, but the bullets fired on it bounced back. The Germans were dumbfounded, and all of a sudden they were in chaos, and of course they lost the battle. This strange thing is the tank. A tank is a comprehensive weapon that can attack, defend and move. It is loaded with guns, which can destroy the opponent's position and open the way for infantry. Its tough armor can withstand bullets and shells. Its speed is very fast, and it can travel 70 kilometers in an hour. There was a pair of tracks on the outside of the tank wheels, as if wearing a pair of wide and long shoes, which increased the area of contact with the ground. Therefore, the tank was heavy, but it would not sink when driving on loose and soft ground. Nowadays, people have made various anti-tank weapons, and of course, the performance of the tank is constantly improving.