This article relies largely or entirely on a single source. (December 2017)
This unit was mainly composed of the future intellectual elite of Serbia. At the start of the war, many young men from both Serbia and Austria-Hungary left school and made themselves available to the High Command of the Serbian army. They were sent to the military school in Skopje. Even though their training wasn't yet completed, the development of the events forced the High Command to dispatch them to battle.
The Serbian army was in retreat, demoralized, in shortage of ammunition, Belgrade was in the enemy's hands, so the world already came to terms with the complete breakdown of Serbia. All available forces were needed for the crucial battle, which is why the corporal ranks were distributed to the youngsters in Skopje (hence the name), and were sent for Kolubara and Suvobor the next morning. There, the Serbian army, led by Živojin Mišić, pulled off one of the most important victories in World War I.
1300 corporals symbolize a battle for freedom of their country and people, mainly because most of them were youngsters who went into the battle on their own initiative.