Warning
A Dunkirk disaster must lead to German victory. Suppose a no halt order, 300k troops surrender in the Flanders pocket on June 3, 1940 after being mowed down on the beaches by Junkers for several days. Spain joins the war expecting Britain to make a quick peace. Fearing that the invincible German Wehrmacht will turn to the east the Soviets quickly request talks in late June for deepening the Nazi Soviet alliance and dismantling the effete British Empire. After several weeks of negotiations in July the Soviets agree to invade Persian Gulf, and Hitler agrees to keep troops out of Finland and pressure Turkey to accept Soviet warships through the Bosporus.
A Soviet and Italian pincer attack on the Middle East wipes out the British presence in the area. The Japanese begin taking out the British East Indies in December as the Soviets are landing paratroopers in Oman. The Japanese think that the all powerful Axis alliance (Germans, Italians, Spanish, and Soviets) will protect them so they don't fear US intervention. The Brits then seek an armistice in May 1941 after a critical portions of their empire have been taken off the map and the Germans are poised to launch the invasion deathblow to the British.
A Soviet and Italian pincer attack on the Middle East wipes out the British presence in the area. The Japanese begin taking out the British East Indies in December as the Soviets are landing paratroopers in Oman. The Japanese think that the all powerful Axis alliance (Germans, Italians, Spanish, and Soviets) will protect them so they don't fear US intervention. The Brits then seek an armistice in May 1941 after a critical portions of their empire have been taken off the map and the Germans are poised to launch the invasion deathblow to the British.