The problem was first studied during the last year of the Second World War. The only countermeasure against the V-2 missile that could be devised was a massive barrage of anti-aircraft guns. Even if the missile's trajectory were accurately calculated, the guns would still have a small probability of destroying it before impact with the ground. Also, the shells fired by the guns would have caused more damage than the actual missile when they fell back to the ground. Plans for an operational test began anyway, but the idea was rendered moot when the V-2 launching sites in the Netherlands were captured.