help with " II./A.R.361, Ia Az.13 "

[Ernst-H]

Hi,

I am seeking some assistance with the following note I found on a document from late 1944.

II./A.R.361, Ia Az.13

the part reading "II./A.R.361" of course means 2nd Batl. of Artillery Regiment 361

But what doe the part " Ia Az.13 " mean?

thanks !!