Reed, the A.F. marking indicates Artillerie zu Fuss or Foot artillery as opposed to Field Artillery. Foot artillery were "heavies". Each regiment was made up of two battalions, a heavy field howitzer (15cm) battalion and a Mortar (21cm) battalion.
The mortar battalion consisted of two batteries of four mortars each. These were batteries 5 & 6. The howitzer battalion consisted of batteries 1 thru 4; each battery had four guns.
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