What 4th Army?
According to The World War One Source Book, the Serbian Army contained four armies:
The 1st, 2nd, 3rd and Uzhitse Army (or Army of the West) in addition to the independent brigades (which I assume are contained in the various Garrison units).
There was no 4th Army.
Ucize (choose your spelling) is currently represented by a garrison unit. It should be stronger (new unit type), but I'm not that far yet.
The eternal privilege of those who never act themselves: to interrogate, be dissatisfied, find fault.
- A. Solzhenitsyn