Aircraft carriers changed that entire relationship.
The ships might never see one another.
A carrier commander could attack an enemy located two hundred miles away.
He might launch aircraft based on a scout report several minutes old.
By the time the strike reached the reported position, the enemy could have moved dozens of miles.
The carrier itself had to remain hidden while sending aircraft outward to locate and destroy the opponent.
This created a new form of uncertainty.
A battleship admiral could often see enough of the tactical situation to react directly.
A carrier admiral had to make major decisions while information remained incomplete.
Spruance's personality happened to fit that uncertainty unusually well.
He disliked guessing unnecessarily.
But when a decision could no longer be postponed, he could make it quickly.
More importantly, he could distinguish between information he needed and information he merely wanted.
That sounds like a small difference.
In command, it can be enormous.
A commander who insists on perfect information before acting will frequently act too late.
A commander who acts without enough information can destroy his own force.
Carrier warfare lived between those extremes.
So did Spruance.
The Man He Replaced Could Hardly Have Been More Different
William Halsey was one of the most recognizable American naval commanders in the Pacific.
He was aggressive.
Energetic.
Blunt.
An aviator by qualification.
His officers knew exactly how he felt about taking the war toward the enemy.
Halsey had commanded Enterprise during early carrier raids against Japanese-held positions.
His leadership style fit the public image of an offensive admiral.
Then, shortly before Midway, his health failed him.
A severe skin condition left him unable to remain at sea.
This created a difficult problem for Nimitz.
The intelligence picture suggested a major Japanese operation was approaching quickly.
There was no time for a gradual transition.
The carrier task force needed a commander immediately.
Halsey was asked whom he trusted.
He named Raymond Spruance.
At first glance, the recommendation seemed strange.
Spruance lacked direct carrier-command experience.
But Halsey knew him.
Spruance had commanded cruisers within Halsey's task force.
He had watched carrier operations closely.
More importantly, Halsey trusted his judgment.
Halsey also left behind an experienced staff familiar with aviation operations.
Spruance would not need to pretend he knew more about carrier mechanics than the specialists around him.
He could use them.
One of the most important was Captain Miles Browning, Halsey's chief of staff.
Browning understood carrier aviation deeply.
He was intelligent and experienced.
He could also be difficult.
Spruance listened to him without surrendering command to him.
That relationship became part of Spruance's strength.
He did not need to be the smartest technical expert in every room.
He needed to recognize expertise, combine it with the broader tactical picture, and decide.
This was command rather than performance.
Nimitz Had Already Decided That Midway Would Be Fought Through Calculated Risk
Admiral Chester Nimitz understood the larger problem.
The United States could not afford to lose its carriers carelessly.
After Pearl Harbor, carriers had become the most important surviving offensive naval assets in the Pacific.
A major defeat at Midway could expose Hawaii and weaken American ability to contest the Pacific for months.
Yet Nimitz also understood that refusing risk would allow Japan to choose the pace of the war.
His guidance emphasized a principle that would fit Spruance almost perfectly.
Take calculated risk.
Do not expose the fleet pointlessly.
But when a good chance exists to inflict greater damage on the enemy than the enemy can inflict on you, accept danger.
That sounds obvious when written afterward.
It becomes much harder when applied before the battle.
How much information is enough?
How close should the carriers approach?
How many aircraft should be held back?
What if the Japanese have another carrier group nearby?
What if the scout report is wrong?
What if the American strike misses?
What if the Japanese find the American carriers while their decks are crowded with aircraft being refueled?
A commander cannot answer those questions through courage alone.
He needs judgment.
Spruance would be judged repeatedly on exactly that balance.
The Americans Had One Advantage Japan Did Not Know Existed
Signals intelligence.
American codebreakers had made significant progress against Japanese naval communications.
Station HYPO at Pearl Harbor, associated especially with Commander Joseph Rochefort and his team, was piecing together the Japanese plan.
A coded objective known as "AF" appeared repeatedly.
American analysts suspected AF meant Midway.
To test the theory, Midway transmitted an uncoded report claiming a problem with its freshwater system.
Japanese communications soon referred to AF as suffering a water shortage.
The connection was clear enough.
Japan was preparing to strike Midway.
This knowledge transformed the strategic situation.
The Japanese believed they were conducting an operation intended partly to draw American carriers into an unfavorable fight.
Instead, the Americans could prepare an ambush.
Nimitz positioned his carriers northeast of Midway before the Japanese arrived.
The Americans would still be outnumbered in important ways.
But surprise would no longer belong entirely to Japan.
The Japanese knew Midway existed.
They did not know three American carriers were waiting nearby.
Spruance's job was to preserve that advantage long enough to use it.