مؤتمر القاهرة
Only four days after returning from the Moscow Conference, Ismay left England again for the Cairo Conference and Teheran Conference with Churchill. One major source of conflict at the Cairo Conference was an American proposal to appoint an overall commander for the strategic bombing of Germany. Ismay and the British were strongly opposed, and Ismay wrote a long paper against the idea, which became the basis of British policy on the subject. At Teheran, Ismay helped to argue the case for Operation Overlord, but immediately after the conference he developed bronchitis and returned to England by ship, scrapping his other plans for the trip.