"The First Team" is the definitive source on the American side at Midway.
"Shattered Sword" is the definitive source on the Japanese side.
The authors of "Sword" drew heavily on "The First Team" for their information on American activities, and John Lundstrom (author of "The First Team") was a cooperative and major reference source for "Sword."
"Shattered Sword" corrects a lot of major misconceptions that were propagated by earlier books, including "Miracle at Midway" and "Incredible Victory."
The authors of "Sword" show that the US victory at Midway was neither incredible nor a miracle; they demonstrate that the Japanese plan was so poorly conceived and executed that the Japanese had no real chance from the beginning. The only way they could've avoided defeat was if the Americans hadn't showed up.
All earlier works on Midway took most or all of their information about the Japanese side from Mitsuo Fuchida's "The Battle That Doomed Japan." The authors of those works all accepted Fuchida's book as an authoritative history, not understanding that it was nothing of the sort.
Japanese historians knew all along that Fuchida's book was one of a large genre of semi-fictional tales published in Japan during the immediate post-war years by surviving officers. They were feel-good books intended to make the Japanese public feel proud of the great effort and bravery that their military exhibited in defeat. Their theme was, "We were brave, we were daring, we were strong, we were smart, and if it wasn't for a few bad breaks we might've won." Fact is, while they were indeed brave and daring, they weren't nearly as strong as their leaders told them they were, they didn't fight smart, and they screwed up so badly that even if they'd gotten every possible good break, they never had a good chance of winning that battle and they never had a prayer of winning the war.
Apparently because of the language issue, Japanese historians never realized that their American counterparts were taking Fuchida seriously until more than half a century after the war! They mostly didn't even realize that Fuchida's book had been translated into English, since that genre of books generally wasn't translated or published outside of Japan.
"Sword" debunks many long-held myths about Midway. We've believed for years the dramatic image of the SBDs dropping on the IJN carriers with their decks full of fueled and armed aircraft, just as they started to launch their strikes. Fuchida described it so dramatically! In fact, none of the Japanese carriers had planes on deck, and numerous US Navy combat reports noted their empty decks. But everyone was fixated on Fuchida's dramatic but fictional rendition.
Likewise, we're all read about how the doomed torpedo squadrons drew the Japanese CAP down to wavetop height, allowing the SBDs to come along unmolested above. Fuchida told it like that, but in fact the Japanese had plenty of time to set up a high CAP after the torpedo attacks and before the dive bombers arrived. They just did such a lousy job of managing their CAP assets that they didn't get it done.
Fuchida tells of the Japanese carriers reeling under bomb hit after bomb hit, finally sinking after taking more hits than any ship could possibly survive. He told it so well that American historians failed to note the combat reports. In fact one of the carriers was sunk by a single hit, but Fuchida wasn't about to tell his readers that some of those ships might've been saved if the Japanese Navy wasn't so incompetent at damage control.
Previous writers have made much of the great discrepancy in forces between the Japanese and the Americans, but "Sword" points out that the Japanese plan had their forces so scattered that at the point of contact the two navies were about evenly matched, and the Japanese reserve forces were so far away that they had no possibility of getting into the fight.
"Sword" challenges many other long-held ideas about Midway, and it does a good job of substantiating its challenges. Like "The First Team," it's a must-read for anyone who's interested in Midway and the early Pacific war.