The armament, naturally, reflected the changing circumstances of warfare and technological progress. At first, the destroyers were expected to escort, augment and protect the battleline, that is, the capital ships. This was reflected in the emphasis on the installation and development of anti-ship weaponry - guns and torpedoes. As a result, the "legacy" and inter-war classes were deficient in anti-submarine (ASW) and anti-aircraft (AA) weapon systems. The effect can be seen in the particularly high rate of loss to air attack in the early war years.