The first book to examine the battleship-led 1941 Pacific Fleet as it was intended to fight. Packed with illustrations, this study explains how the US Navy saw the approaching war unfolding. When the Japanese attacked Pearl Harbor, the Pacific Fleet was the most powerful in the US Navy. It was still dominated by battleships, but since the late 1930s had been developing naval aviation and integrating them with its battleship-led doctrine. This book is the first to examine the Pacific Fleet as it was intended to fight, and how it had been training and preparing in the months leading up to December 7, 1941. Naval historian Mark Lardas explains how, contrary to modern assumptions, it was not wedded to the battleship, but was hedging its bets, building up both its carrier and battleship strength. Most crucially, it had also been building and honing a massive fleet train, enabling the Pacific Fleet to operate easily thousands of miles from home. It was this foundation that enabled the Pacific Fleet to adapt so rapidly to the new world of carrier-led naval warfare, and first check and then defeat the IJN. With artwork, photos and diagrams, this is a portrait of 1941 in the Pacific Fleet, the last time and place when battleship doctrine held sway. Pearl Harbor would shatter this, and herald the start of the carrier era. The blow fell heavily on the US Pacific Fleet, but it and its successors would emerge more powerful than ever.