During the first world war, so many shells (bombs) were fired that they will be picking up the unexploded munitions for centuries. The bombs would fall. The bombed would crawl into their holes and dugouts and wait. And then when the bombs stopped, they would come out and continue to defend their positions.
That is why the “strategy” of shelling positions for hours before a charge of infantry was so futile. That is much of the reason those charges were so ineffective and why so many men died. The futility of the shelling was why the lines so thoroughly stagnated.
During the second world war, campaigns of dropping carpets of bombs certainly reduced cities and people to rubble, but were remarkably ineffective at weakening hardened military and industrial targets which were built to withstand.
In Vietnam endless bombing and defoliation raids had almost no effect on the Viet Cong who, in the end won their war of “liberation,” from United States imperialism.
But hey, I am sure that bombings will 100% accomplish military objectives in world war three. It’s a given.
