Andrew,
The 3 is a typo. It should have been a 4. I did not notice that error. Sorry about the confusion.
Yes, I have Generals in Blue. I see why there is so little about Brevet General George M Ziegler. I tried writing his full bio. The more I researched him the more confusing it became. I see why all the sites only mention his service record (and not his personal life). That is bio is still a work in progress. I'm taking a break from it. I will return later and see if I can make sense of the confusing and conflicting records at FamilySearch.
One note about Ziegler. In the 1900 census he was listed as General George Ziegler. (only census that listed him as "General"). I wonder if added General was the census taker's idea, or if it was Ziegler's idea. Since that is the only census record of his that I have found that called him General, I suspect the census taker did it. (Still have not found his 1880 census record.)