Landsturm
The Landsturm consisted of men aged 34 to 55 who belonged to the Austria k.k. Landsturm and the Hungarian k.u. Landsturm. The Landsturm formed 40 regiments totaling 136 battalions in Austria and 32 regiments totaling 97 battalions in Hungary. The Landsturm was a reserve force intended to provide replacements for the first line units. However, the Landsturm provided 20 Brigades who took to the field with the rest of the army.
Read more about this topic: Austro-Hungarian Army