A very detailed analysis of Hitler's prospects for a naval invasion of Britain, which was marginal at best after the German navy's losses against His Majesty's fleet off Norway, and a critical rebuke of the longstanding narrative that the RAF constituted Britain's chief defensive hope against said invasion. Hewitt reviews the types of ships and aircraft available to both Britain and Germany, and points out that the Luftwaffe's ability to hit the Royal Navy at sea was almost nonexistent; in addition, the German navy was very poorly equipped to attempt a land invasion in the best of circumstances, with clumsy barges rather than the made-for-purpose landing craft employed in Overlord. Against turbulent seas and the might of the Royal Navy, even Hitler's arrogance had to bow to the reality that the sceptered isle would be too tough a nut for him to crack in 1940, and that Britain's defenses would only grow stronger in future. This is an extremely detailed and welcome work, bout it may scare off readers who are accustomed to more casual/less analytical histories like those of Stephen Ambrose, etc.