Hitler's Armada

Geoff Hewitt's examination of Operation Sea Lion and Britain's naval defence during 1940 provides readers with a detailed exploration of one of World War II's most critical periods. The book focuses on the German invasion plans and the Royal Navy's response during the months when Britain stood most vulnerable to assault across the Channel. Hewitt approaches this well-documented period with particular attention to the naval dimension, offering insights into both German planning and British defensive preparations.

The title accurately reflects the book's dual focus: the armada that Germany attempted to assemble for its cross-Channel invasion, and the Royal Navy's readiness to counter this threat. Following the fall of France in June 1940, the strategic situation left Britain exposed, and Hitler's military command began developing plans for an amphibious operation that would require unprecedented coordination between the Wehrmacht, Kriegsmarine, and Luftwaffe. Hewitt examines how these plans evolved and why they ultimately remained unexecuted.

The book devotes considerable attention to the logistical challenges facing the German invasion force. The Kriegsmarine's limitations become evident through Hewitt's analysis, as the German navy had suffered significant losses during the Norwegian campaign earlier in 1940. The shortage of suitable landing craft, the need to convert river barges for sea crossings, and the vulnerability of slow-moving invasion convoys to naval attack all feature prominently in the narrative. These practical obstacles illuminate why Grand Admiral Raeder and his staff viewed the operation with considerable skepticism.

Hewitt's treatment of the Royal Navy's defensive posture demonstrates the service's determination to prevent any invasion attempt from reaching British shores. The positioning of destroyer flotillas, cruiser squadrons, and capital ships receives detailed coverage. The book explores how the Admiralty planned to intercept German invasion forces, accepting that such operations would occur primarily at night and in waters where the Luftwaffe could impose heavy costs on British warships. The willingness to accept substantial naval losses to prevent a successful landing reflects the existential nature of the threat.

The interplay between air power and naval operations forms a central theme throughout the work. The Battle of Britain's outcome directly influenced the feasibility of any invasion attempt, as German control of the air space over the Channel was deemed essential for protecting invasion convoys. Hewitt discusses how the Luftwaffe's failure to achieve air superiority fundamentally undermined the entire operation. Without the ability to shield slow-moving barges from British naval and air attack, the invasion would face catastrophic losses.

The book benefits from its focused timeframe, concentrating on the specific months when invasion appeared most plausible. April through October 1940 encompasses the period from initial German planning through the eventual postponement of Operation Sea Lion. This chronological approach allows readers to follow the evolution of both German intentions and British countermeasures as the strategic situation developed.

Hewitt draws upon German naval archives and British Admiralty records to construct his narrative. The documentation reveals the contrasting assessments within German military leadership, with the navy expressing far greater reservations about the operation's prospects than the army. These internal disagreements within the German command structure contributed to the repeatedly delayed invasion date and eventual abandonment of the plan.

The defensive preparations undertaken by Britain receive thorough examination. Beyond the Royal Navy's plans for engaging invasion forces at sea, the book touches upon coastal defences, the Home Fleet's disposition, and the coordination between naval and military commands. The scale of British preparations demonstrates how seriously the threat was taken, even as historians have subsequently debated how realistic the German plans actually were.

One strength of Hewitt's work lies in its attention to the practical realities of amphibious warfare. The technical challenges of launching and sustaining an invasion across the Channel, particularly with improvised equipment and limited specialized landing craft, receive appropriate emphasis. These details ground the narrative in operational reality rather than hypothetical speculation.

The book serves readers interested in naval history and the critical summer and autumn of 1940. While the outcome of Operation Sea Lion's cancellation is well known, Hewitt's detailed examination of the planning, preparation, and defensive measures provides valuable context for understanding this pivotal moment. The work contributes to the extensive literature on Britain's survival in 1940 by maintaining its focus on the maritime dimension of the threat and response.