Game of the Week, March 9-15

From March 9 through March 15, this week’s Game of the Week crosses the Channel in the wake of William the Conqueror—but with barges instead of longships and the fate of a continent riding on a few narrow sea lanes. Panzer Campaigns: Sealion ’40 is featured at 25% off, inviting you to explore the most audacious question of 1940: what if Germany had tried to carry the war onto British soil?

This isn’t a loose “what-if” daydream. Sealion ’40 is grounded in actual German operational planning for the invasion—staff concepts, landing priorities, shipping assumptions, and the very constraints that made the idea so perilous. The game’s scenarios turn that paperwork into hard choices: where to land, how to break out, and how to keep an invasion alive when weather, air power, and the Royal Navy all have a vote.

The Invasion that never was

The Gamble

By June 1940, the war had turned with shocking speed. France had fallen, the Low Countries were occupied, and the British Army had escaped at Dunkirk—alive, but stripped of much of its heavy equipment and scrambling to rebuild. Britain’s defenses were a patchwork of improvised coastal works, reorganized regular formations, and hastily armed local units. Yet the island’s greatest advantage remained unchanged: the Channel was not a frontier line on a map, but a living barrier of tides, weather, and naval power of the Royal Navy. If Germany meant to finish the war in the West, it would have to do it under the gaze of the Royal Navy and within reach of Fighter Command.

German planning for an invasion—Unternehmen Seelöwe—was never a single clean blueprint. It was a stack of memoranda, annexes, staff maps, and shipping tables that changed as quickly as reality forced them to. This is why Sealion ’40 lands differently than a “pure” hypothetical: the narrative is built around the same issues that dominate the surviving paperwork—where the army wanted to land, what the navy could actually carry, and what the Luftwaffe claimed it could keep away from the sea lanes. The tension isn’t invented; it’s inherent in the planning documents themselves. (See also one of our weekly blogposts for a deeper insight in this and Japan '45 and Japan '45)

The Landings

From the start, the services pulled in different directions: the army argued for a wide landing front to avoid a cramped, easily sealed beachhead, while the navy feared that width because every added mile meant more small-ship convoys exposed to interception. The Luftwaffe insisted it could keep British air and sea power at bay—but only if it first won air superiority. Historically, Sealion remained a German Planspiel and was shelved once Fighter Command proved impossible to neutralize and the naval/logistical risks became prohibitive.

Invasion barges assembled at the German port of Wilhelmshaven (Bundesarchiv, Bild 101II-MN-1369-10A / CC-BY-SA 3.0)

In this campaign, the balance tips just enough. The air battle peaks in August and the RAF’s narrow margin finally breaks—not destroyed, but squeezed into a defensive economy of shorter patrols, thinner coverage, and widening gaps. The Luftwaffe shifts from winning duels to slowing Britain’s reactions: hammering communications, rail junctions, and the ports that must move men and supplies along the south coast.

The invasion plan tightens as it goes—much as it did in the 1940 staff papers. Early concepts flirt with wider landings from Kent toward Dorset, even with outliers like the Isle of Wight or Devon. Reality forces concentration: limited shipping, the need to keep fighter cover overhead, and the impossibility of sustaining scattered bridgeheads across open water. By late September the scheme becomes sharper and more dangerous—fewer beaches, heavier density, and an implicit admission that the first days will decide the campaign.

The opening is a race for time, because time becomes supply. Minefields are laid to protect the crossings; improvised invasion traffic—barges, tugs, and small coasters—pushes across under darkness, smoke, and air cover. The south coast becomes a chain of violent choke points: beach exits, seawalls, coastal batteries, roadblocks, and the first inland high ground that controls movement off the shore.

For Britain, the immediate task is containment. Local commands and ad hoc groups fight to deny clean breakouts and to hold the road-and-rail lines that lead toward London. Fieldworks and obstacles matter, but the decisive truth is logistical: if the Germans can’t get fuel, ammunition, and guns inland, their beachhead becomes trapped strength. British units trade space for time where they must, falling back onto secondary lines while preserving cohesion for counterstrokes.

German operational map of the landings in southeast England (Imperial War Museum/ Public Domain)

German gains are real. Airborne forces seize crossings and cut wires; assault infantry carve lodgments deep enough to feed follow-on waves; mobile elements appear sooner than defenders expect, exploiting weak junctions and gaps. But every kilometer inland stretches the invasion’s most fragile limb—the supply corridor from the beaches and ports. Ports become existential objectives: take one and the beachhead can breathe; fail, and it begins to starve.

From there, the campaign hardens into brutal choices that mirror the 1940 invasion problem. Do the Germans gamble on depth—pushing for decisive ground at the risk of supply collapse—or consolidate and build capacity, giving Britain time to mobilize reserves? Do the British counterattack immediately to throw the invader back into the sea, or build a stronger line closer to London and let German momentum bleed away? As the front edges toward the capital, the war becomes a race between reinforcement and exhaustion.

London is not just a victory location. It is a rail hub, a command center, and a gravity well that reshapes every British decision. Yet it is also surrounded by defensive advantages once organized: rivers, choke points, and dense urban terrain that punishes rapid mechanized advances—especially under air threat. The outcome turns on whether Germany can convert early momentum into something durable, able to survive bad weather, supply issues, and the arrival of fresh, increasingly coordinated defenders.

Big Ben and the Houses of Parliament in London, the ultimate prize for the German invasion force (National Archives and Records Administration / Public Domain)

Sealion ’40 lives on that knife-edge: a landing is only the first step, and the water behind you can become the most dangerous front of all.

To reflect the real debates inside German planning, the game offers two playable Sealion variants: an early July invasion window and a later, better-prepared September alternative.

What's in the game

• Sealion '40 includes 49 Scenarios – covering all sizes and situations, including a solo tutorial scenario plus specialized versions for both head to head play and vs. the computer AI.
• The master map (61,200 hexes) stretches from Bristol in the west to Margate in the east. The critical landing beaches and the Greater London area are included.
• The order of battle file covers the Axis and Allied forces that participated in the campaign with other formations added in for hypothetical situations.
• Order-of-Battle, Parameter Data and Scenario Editors which allow players to customize the game.
• Sub-map feature allows the main map to be subdivided into smaller segments for custom scenario creation.
• Sealion '40 provides multiple play options including play against the computer AI, Play by E-mail (PBEM), LAN & Internet "live" play as well as two player hot seat.

Books and videos and podcast

As always, below you find a list of book recommendations to get deeper into the historical background. Clicking the book cover brings you to Amazon.

Bodleian Library. German Invasion Plans for the British Isles, 1940. Bodleian Library Publishing, 2007.

Kieser, Egbert. Operation “Sea Lion”: The German Plan to Invade Britain, 1940. Cassell, 1999.

McKinstry, Leo. Operation Sealion: How Britain Crushed the German War Machine’s Dreams of Invasion in 1940. John Murray, 2014.

Schenk, Peter. Operation Sealion: The Invasion of England 1940. Greenhill Books, 2019.

and some videos (historical and gameplay)

and finally a podcast

Screenshots

Below, you can see screenshots from Sealion '40 to get a feel for the 2D and 3D views and the scale of the engagements. Clicking a screenshot opens it in full resolution.

We hope you enjoy this week’s Game of the Week: Panzer Campaigns: Sealion '40  Like all WDS titles, it provides countless hours of rich historical gameplay at a very attractive price.