First, do you mean SS-Obergruppenführer Reinhard Heydrich, chief of the Reich Main Security Office, and Reich governor of Bohemia and Moravia? BTW his genetic (and suspected Jewish) grandfather was named Reinhold Heydrich? Yes, The Night of the Generals (1967) was a good film, but I believe they used SS Oberst Jochen Peiper as the model for O'Toole's general. He was referred to by his men as "Blowtorch Peiper" for his unforgiving. no mercy assaults in Russia, Italy and the Bulge.
Peiper was also the 'hard as the steel of our tanks' role model for Robert Shaw's Col. Martin Hessler in Battle of the Bulge (1965).
Yes, O'Toole played a terrific psycho in 'Night' and as the stories go about him, he was considered more than a bubble off plumb by his cohorts and co-stars... But I loved just about ever film he made.
Not many people know this, Normy, but Peter O'Toole was known to take a drink now and then...
Yep, O'Toole got ripped once in Picksley and it took two deputies, the High Sheriff, four state troopers and a Salvation Army Colonel to get him out of the outhouse!
The grandfather in question was one Gustav Robert Suess, who was the SECOND husband of Heydrich's paternal grandmother, and not in the Heydrich family line of descent. The matter was investigated at the instigation of Greogor Strasser, and it turned out Herr Suess was not Jewish, either. Source "Reinhard Heydrich: A Biography", by Guenther Deschner, pp61-62.