Just a thought I had after reading some of my old stuff, what if Rommel had successfully taken Tobruk in 1941, would he have been content then to sit on his laurels and get the Italians improving the infrastructure in North Africa, or would he have tried to push on into Egypt? And what would the British have done in either case? would a static border allow them to keep sufficient forces in the Far East to make Malaya and or Burma a tough nut to crack?