When we think of WWII operations - there is a gap that occurs around 1943 while the Allies were fighting in North Africa and Sicily and Kursk occurred on the Eastern Front. Here is a very good thesis on the German-Romanian defense of the Kuban bridgehead - and how they held it during a critical time on the Eastern Front. For those who never heard of the Kuban Bridgehead - there is an old movie called Cross of Iron that occurs at the PLT level in it that you may want to see.