This is the last time in this mini-series where Byron and Natalie have a scene together. They wouldn't appear together again until the end of the fourth part of the sequel.
The Fall of Tobruk mentioned here by Byron refers to the British capture of Tobruk in Libya from the Italians under Marshal GrazianI, Lieutenant General Tellera and Major General Mannella. This was achieved as a part of the greater Operation Compass by efforts from the combined forces of the 7th British Armoured Division, along with the Sixth Australian, by Wednesday the 22nd of January, 1941.