"Operation Outward was a British World War II program to attack Germany by means of free-flying balloons. It made use of cheap, simple balloons filled with hydr

"Operation Outward was a British World War II program to attack Germany by means of free-flying balloons. It made use of cheap, simple balloons filled with hydrogen. They carried either a trailing steel wire intended to damage high voltage power lines by producing a short circuit..." https://en.m.wikipedia.org/wiki/Operation_Outward https://en.m.wikipedia.org/wiki/Operation_Outward