Artillery pieces are by B&B and RAFM. The B&B Krupp gins have split trails, which I don't think are accurate, but I haven't been able to confirm this.
I acquired an Ebay lot of about 25 Wurttemberg gunners hence the over representation of their artillery arm - the first two rows of guns (and first four rows of gunners) in the picture above. In fact the Wurttembergers were the only German in the FPW range.
Prussian and Bavarian gun crews (Bavarians the middle of the three crews). These figures are conversions now available from John Cunningham. Most of the guns in this photo are RAFM. They have single trail carriages but the moulds are obviously well past their prime, with parts missing.