Anti-Aircraft Gunfire. Methods Employed in Foreign Countries. Copy of a Letter from the Deputy Director of Military Intelligence

The modern conception of A.A. gunnery is the concentration of the maximum shell density over a short period prior to the attacker releasing his bombs. This concentration might be achieved by some form of barrage, i.e. by bombarding a selected area so that the shells arrive at a predetermined time and the attacker has to fly through the curtain of fire. Such a method is not comparable in accuracy to continuous aimed fire following up the attacker. That it should have proved successful does not suggest much determination in pressing the attacks home.