what a small world! There were no "catholic" saxon units since Saxony is mostly protestant. Only units from the Lausitz may had some more Catholics in the ranks. All the mentioned regiments were part of the XIX. (2nd Royal saxon) Corps. The 89th infantry brigade consisted of the 133rd and 134th regiments (40th division). Regiment No. 107 was part of the 48th infantry brigade, 24th division. The mentioning of Leipzig is correct, Regiments No. 106, 107 and 134 were garrisoned there plus some more units from the Corps and the command.
>He mentions talking to Saxons and amongst them soldiers wearing a green lanyard with tassels whom he was told were Prussian snipers.
Hm, maybe these were "Schützenschnüre" or something. It seems to be strange to find something like that in battle.