In the long history of the Red Army, there have been three major front armies: the Red First Army, the Red Second Front Army, and the Red Fourth Front Army. They were the main forces of the Long March, and ended the Long March with the meeting of the three main forces. However, it is puzzling that the numbers are usually arranged in numerical order, except for the absence of the Red Front. This has to start with the early development of the Red Army. The Communist Party initially did not have an army of its own, but relied on the awakened old army and the progressive peasants to carry out the revolution. As a result, in the early stages, there was no formal preparation and planning. For a long time, the leadership of the Chinese Communist Party consisted mainly of people from the Soviet Union or the Comintern. In their opinion, only troops trained in large-scale operations and regularization could be called "Red Army". Therefore, before January 1930, only the troops of ** and *** could be called the "Red Army", and the troops of ** and others were called guerrillas. 
With the continuous change of the situation, out of the needs of the revolution, it was decided to unify the number and establishment of all troops. Initially, the larger units of the Red Army were organized into eight corps. On April 15, 1930, in view of the rapid growth of the forces at that time, it was decided to form three corps according to the territory. In May of the same year, the Council of Representatives of the Red Army was again adjusted to form four corps. Among them, the Red Army formed the Red 1 Corps, the Red Army formed the Red 2 Corps, the Red Army formed the Red 3 Corps, and the Red Army formed the Red 4 Corps. Soon after, red.
The First, Second, and Third Army Corps were established one after another, but the Red Fourth Army Corps could not be established in time due to the long distance and inconvenient communication. This historical vacancy became a unique phenomenon in the history of the development of the Red Army. In August of the same year, the 1st Red Army led by the great *** and the 3rd Red Army Corps led by *** gathered in Liuyang, Hunan, in order to prepare for the second attack on Changsha.
In order to achieve unified command, ** took the initiative to propose the establishment of the Red First Army and the General Front Committee, and the Red Third Army Corps was incorporated into the Red First Army, so that even if other changes occurred in the future, the Red Third Army Corps would not be expanded into a front army.
Although the attack on Changsha was unsuccessful, *** did not care about personal gains and losses, and his noble style avoided many unnecessary disturbances. After a joint meeting of the front committees of the two corps, the proposal was adopted, so that there was no Red Three Front Army expanded by the Red Third Army Corps.
After that, ** actually considered forming another Red Three-Front Army, but that was already the time for the Long March. Let's leave this front aside for a moment. The second Red Front formed was the Red Fourth Front.
In January 1931, the Red First Army and the Red 15th Army in the Hubei-Henan-Anhui Base Area met in Changzhuyuan, south of the city of Henan, and merged into the Red Fourth Army. In November of the same year, the Red Fourth Army and the newly established Red 25th Army joined forces to attack Huang'an County, and the Red Fourth Front Army was established in order to unify the command, with ** as the commander-in-chief and Chen Changhao as the political commissar.
However, it should be noted that this Red Fourth Front Army was not originally the product of a unified plan, and the original plan was to give priority to the formation of stronger armies into red.
The First and Second Fronts, so the Red Fourth Front was supposed to be called the Red Second Front.
However, it was later a fait accompli, and the Red Fourth Front also considered changing its name, but it could not be realized for various reasons, which was also the reason for the failure of the Red Third Front (if it was called Red Two, the next one to be established would be Red Three, and there would be no Red Four). At the same time, because it was not a unified plan, before the middle of the Long March, many people in the **Soviet area called them the "Red Fourth Regiment".
In the end, it was the Red Second Front Army that was formed. On October 24, 1934, the Red 3rd Army and the Red 6th Army celebrated their victory in the Muhuang area of Yinjiang County, eastern Guizhou, and then the Red 3rd Army restored the name of the Red Second Army. At this time, ** had already intended to build the Red Second Front, but due to the lack of numbers, this plan could not be realized. It was not until July 1936, in accordance with the instructions of **, that the 2nd and 6th Army Corps of the Red Army and the 32nd Army of the Red Army were combined into the Second Front.
The creation of the Red Third Front Army was originally also in the first plan, and the two Red Army Corps were successfully developed and combined into the Red Third Front Army after the two Red Army Corps successfully went north. However, this plan was intercepted by the Kuomintang's heavy troops, and Fang Zhimin, Xun Huaizhou, Liu Chouxi and others died bravely, and only Su Yu led a small number of troops to successfully break through. Therefore, the plan for the creation of the Red Trilateral Army had to be shelved.