Why V-2 rockets were effectively impossible to intercept

What made V-2 rockets so hard to defend against?

Once launched, their speed and trajectory exceeded contemporary detection and interception capabilities; only launch-site or boost-phase attack was plausible.

The V-2 descended too fast and steeply for contemporary fighters and anti-aircraft guns to acquire and engage reliably. It had no terminal guidance signal to jam, and warning often arrived only with the explosion. The practical counter was to attack launch sites or catch the rocket during boost, while reported terminal interceptions were at best extraordinary accidents rather than a workable defense. Later ballistic-missile defence concepts required entirely different detection and interception systems. A reported British gun interception is treated as an accidental meeting with an existing barrage, not evidence that contemporary artillery could deliberately track a descending V-2.