What were the preparations and logistics like for the arrangement of the big Allied conferences of WW2 like Casablanca, Tehran, and Yalta? What security measures were taken to get the leaders there safely and secretly?
I've written a bit about the journeys of leaders during the war, though I'm afraid it stalled a bit in 1943 and I haven't managed to get back to it recently. One day I'll get to Potsdam!