From the start of work of the Army Ministry in Serbia (1862), the figures in the post of Minister were changing frequently. This was not only the main characteristic of the peacetime period but also the period of wars that Principality and Kingdom of Serbia waged trough history. Exactly the same case was during the WWI. In that period some four high ranked officers took this post. One of them, General Božidar Janković, served as a War minister three times continuously. The complex reasons for frequent changing of War ministers were not elaborated within this paper.