I remember this too and hopped on the evil Google to get more information
https://warfarehistorynetwork.com/daily/pattons-bloody-battle-at-fortress-metz/
good article and information of why Patton was slowed there...
My Dad, who just passed at 94, served w/Patton’s 3rd Army Corps, as a Combat Engineer Platoon Sgt:
During World War II, from March 27th, 1943 to December 2nd, 1945, Dad served as Platoon Sgt with the 101st Combat Engineers, 26th Infantry Division, 3rd Army (Patton Armored) in the European Theater. He received the Eastern European Ribbon w/ 4 Clusters for Northern France, Rhineland, Ardennes, Central Europe, along with the Purple Heart Medal for wounds he received in The Battle of The Bulge, the Bronze Star Medal w/ 3 Clusters for Valor, American Theater Service Medal and the WW II Victory Service Medal.
He talked with me about the War - once - all thru hundreds of European cities, towns and villages, hedgerows, Ardennes and into Battle of The Bulge, and finally Bastogne, where he was shot by a sniper, dragging his wounded men from a bloody snow field, where they were caught in a nazi machine gun ambush. That was his ticket home, where he met my Mom, his RN caring for him, his childhood sweetheart in York, PA, in a VA Hospital in Virginia, while recovering from his wounds. I was born in 1949 and my sister in 1951.