Trying to find a little information on Reserve Artillery Regiments, what guns they possessed. I know that regular army divisions had a brigade of two regiments. One regiment had 7.7cm field guns, the other often was mixed between 7.7cm and 10.5 cm.
What about reserve divisions which had only one regiment? Was this regiment composed of only 7.7cm guns? Did a reserve corps have only 7.7cm guns, or did they try to make at least one of the two artillery regiments a mix of 7.7 and 10.5?
According to page 135 of Cron's History, 2 of the 29 Reserve Field Artillery Rgts (3rd Guards & 26th) had a 10.5cm Howitzer Btn.
Using Cron's info, at the start of the war, the field army had 4,626 x 7.7cm FK (33 4-gun Horse Artillery Btys; 749 6-gun Field Btys - 459 Regular, 177 Reserve, 80 Ersatz, 11 Landwehr & 22 Landsturm) & 954 x 10.5cm FH (159 6-gun Btys - 153 Regular, 6 Reserve). According to this site's articles on these weapons, there were 5,086 FK & 1,260 FH at the start of the war, which leaves 460 FK & 306 FH unaccounted for. However, Cron comes to the rescue, as on page 271 he says that the Regular Artillery was supported by 203 Ersatz Btys; as 80 of these were in the Field Army, the remaining 123 would absorb 738 'guns', leaving just 28 unaccounted for.
