As I remember my military history book, all modern weapon systems are unreliable and need adequate supplies and protection by other systems. Modern meaning "sin

As I remember my military history book, all modern weapon systems are unreliable and need adequate supplies and protection by other systems. Modern meaning "since Alexander". The systems which need protection also protect their protectors, in complex ways, against different threats. As a simple example, some weapons like howitzers are kept well behind the front line and shoot across it. They protect the front-line troops, but if the troops weren't there the enemy could reach the howitzers.