 The 16 infantry divisions were grouped into four numbered army areas, with headquarters at Novi Sad (1st Army), Sarajevo (2nd Army), Skoplje (3rd Army), and Zagreb (4th Army).Later in 1921, a second cavalry division was formed using the four army-level cavalry regiments.Artillery allocation was one heavy artillery regiment and one howitzer regiment at army level, and one field artillery regiment at infantry division level.