Thoughts on GC40 and GC41:
GC40:
There is a basic problem when a land based force is confronted with naval assets. PC had the same basic problem and "solved" it by turning level bombers into effective anti-surface navy forces. Not historical at all. PC2 has limited the effectiveness of level bombers somewhat by allowing suppression, but the basic problem remains.
Once the remaining Northern allied forces were pinned against the English Channel, naval and air forces really made themselves felt. Thus the player's main ground forces, become less relevant, which is a turn off for the player base.
Calais and Dunkirk might be better thought of a single two-part mission. I suggest building the naval and air fight beginning in Calais and carrying it through to Dunkirk. Introducing the bombers during Calais.
During Calais, have more Hurricanes flying from Southern English fields and put a single field on the edge of the map, with a new squadron showing up every turn or two as reinforcements. Add Luftwaffe bomber formations, flying from the East. The player can use his fighters as escorts.
Then in Dunkirk expand the non-players air assets, again from the East. But then add two wrinkles. First, give the player no starting airfields permitting fighters to range out over the Channel. The player then must push North to seize fields that can support escort fighters for the bombers. Second, limit the player's ground force size. Player forces must then try to punch through to Dunkirk, not with a broad attack, but instead with a rapier thrust.
RAF support of Dynamo can add two airfields to the Northern border of the map, this time including Spitfires, and adding new squadrons as the initial units are chewed up. Try to capture the intensity of the air battle for both sides.
For the allied forces, give them entrenchments at least for some positions and include light AT and AA support for those positions. The dug in covering forces protecting the Dynamo evacuation fought hard and there is no reason not to include that in the scenario.
Concerning RAF in the Battle of France, here is an extract of a very large set of spreadsheets I created while researching RAF Fighter Command squadrons before and during the Battle of Britain. This information is at least 10 years old, so more data may now be available.
https://www.mediafire.com/file/eamm8l2z ... e.jpg/file
I believe Churchill's initial authorization was for 120 Hurricanes (10 squadrons) to be sent to France. More were added as replacements or partial squadron commitments. Only 66 Hurricanes returned to Britain after France surrendered. Note there are no Spitfires. As for the Spitfire IIs used as a cache reward, I doubt there were more than a handful of prototypes in Britain at the time of the Battle of France. Perhaps use more French recon equipment as rewards instead.
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GC41:
Crete has the same kinds of considerations as Calais and Dunkirk. I liked your interpretation of the naval invasion, much better than in the original GC41. It seems to assume the naval assault caught the British unaware and thus avoids the problem of assuming Italian naval forces could show up and perform well in a sustained engagement over several days.
Vyazma, Moscow, Demyansk are brilliant. Much better than PC or PC2. Vyazma is true slog. I made it much worse for myself, because I had taken the Trench Slog malus when setting up my leader. Ouch. Moscow was pretty standard fare until the near the end. Demyansk was a pleasant combination of history and puzzle. I call it a puzzle because it required a change of perspective from all the preceding fights.
Error: In Zhurivka, the defending unit in the town Shevchenkove (7,17) is Wehr Infanterie and should probably be a Soviet Regular.
Soviet Su-6 AA is not appropriate for the time frame. Only four were built and they were use for training. In 1941 Soviet AA should be predominantly towed. The Soviets didn't achieve broad mechanization and motorization until the American equipment pipeline was flowing. So increased use of Soviet built SPAAG in 1942, then a dramatic increase in SPAAG in mid-1943. Still, towed AA should be present throughout the war in Soviet formations, especially infantry units. SPAAG would be more often found in armor units and in the Shock and Guards armies.