How many groups did von Rundstedt command ?
Characteristically , however , he told Rundstedt he agreed with him , then sent Field Marshal Erwin Rommel to France with orders to hasten the completion of the Atlantic Wall ; while von Rundstedt remained the C-I-C in France , Rommel became the official commander of Army Group B. Rundstedt was extremely angered by this decision ; although he admired Rommel 's tactical skill , he knew from his colleagues that Rommel was notoriously difficult to work with and would mostly be able to ignore Rundstedt 's authority thanks to his patronage by Hitler and Goebbels .