One week after D-Day, Germany began launching a new, secret weapon at London. The distinctive roar of V-1 flying bombs would slowly fill the air and then suddenly cut out, followed shortly by the massive explosion as a warhead went off. Dozens would fall in the first week, and the Royal Air Force had to scramble to stop them.
This led some pilots to, after expending all of their ammunition, take more drastic measures to stop the bombs: flying wingtip to wingtip until they either crashed or tipped the bomb off course.
The V-1s had pulsejet engines, and prop-driven planes couldn't keep up with them. But, if a pilot flew to high altitude and then dove toward a passing V-1, the speed from the descent would allow them to keep up.
The first intercept took place on June 15, 1944, the third day of V-1 attacks. A Mosquito pilot was able to shoot one down with his guns, and others soon followed.
But the pilots had limited ammunition, and it was tough to hit the fast-flying V-1s. And each bomb could kill multiple Londoners if it wasn't intercepted.
So some pilots began to experiment with a risky but valuable alternative. If a plane flew close enough to a V-1, the wind off the plane's wings could nudge the flying bomb off course. And if the disturbance was enough to flip the V-1 over, known as "turtling," then it would often fail to explode.
A Spitfire nudges a V-1 missile off course during World War II.
But this had obvious risks. If the pilot accidentally bumped the V-1, they could crash into the ground alongside the bomb. A soft bump was obviously no big deal. It would just help the pilot tip the bomb over. But a harder strike was essentially a midair crash, likely clipping or breaking the pilot's own wingtip.
Despite the risks, the work of pilots and gunners on the ground saved London from much of the devastation. 1,000 of the bombs were shot down or nudged off course in flight. And, the bombs were famously inaccurate, which was lucky for Britain. Of the approximately 10,000 flying bombs fired at the city, around 7,000 missed, 1,000 were shot down, and about 2,000 actually hit the city and other targets.
Eventually, this would result in about 6,000 fatalities and 16,000 other casualties.
In October 1944, Allied troops captured the V-1 sites targeting London and were able to stop the threat there. Unfortunately, that was right as the Germans got the V-2 program up and running, The faster, rocket-powered V-2s were essentially unstoppable with anything but radar-controlled guns.
An American JB-2 Loon based on the German V-1 missile.
(San Diego Air and Space Museum)
After the war, Allied powers experimented with the weapons and some, including America, made their own knockoffs. Some were shot down as flying targets for pilots, but others were held in arsenals in case they were needed against enemy forces. Eventually, the invention of modern cruise missiles made the V-1s and V-2s obsolete.