The rail-mounted weapon could hurl a 120 kg shell with 7 kg of explosive to a range of 131 km. During the 170 second trajectory the shell reached a maximum altitude at the edge of space - 40 km. This was the highest altitude attained by a man-made object until the first successful V-2 flight. From March through August of 1918, three of the guns shot 351 shells at Paris from the woods of Crepy, killing 256 and wounding 620. As a military weapon the gun was a failure - the payload was minuscule, the barrel needed replacement after 65 shots, and the accuracy was only good enough for city-sized targets. But as a psychological tool it was remembered when the V-1, V-2 and V-3 weapons were being developed two decades later.