National Geographic : 1945 Aug
British Official History's Biggest Balloon Barrage Tied Up German Traffic in "Bomb Alley," theRobot Route toLondon Cable-anchored, unmanned balloons entangled 279 low-flying buzz bombs. . Of some 8,070 V-1's launched, only 2,300 reached theLondon area. Fighters and anti aircraft guns got some; others fell in the Channel or exploded in France. London's last line of defense, 2,000 balloons, brought down nearly 15percent ofallrobots entering their zone. More than 100 "sausages" show in this picture.