The battleship’s guns had a reach problem
A battleship’s thick armor and giant guns made it formidable—but only against threats within gun range. A carrier changed the distance at which a fleet could fight. It carried aircraft that could scout for enemy ships and then attack them from far beyond the horizon, while the carrier itself stayed out of sight.
That reach turned a naval battle into a problem of finding and striking, not simply bringing two lines of armored ships close enough to fire. The side that located the enemy first could send planes toward it before the enemy’s battleships could bring their guns to bear.
Why armor could not solve it
Armor protects a ship from damage that hits it. It cannot stop an aircraft from attacking from beyond the ship’s guns, nor help a battleship hit a target it cannot see. A battleship could still be dangerous if aircraft or other forces brought an enemy within range, but its strongest defenses and weapons could not answer every threat on their own.
Carriers also had limits: aircraft needed to be launched, recovered, and supported, and the carrier had to operate with its fleet. But the shift was decisive in one respect: the carrier moved a fleet’s striking power into the air, extending its reach without requiring its heaviest ships to close with the enemy. Dreadnoughts had made naval power visible in the size of a ship; carriers made distance itself a weapon.
