Slitherine

I'm a big fan of conducting Sealion as a way to lock up my western flank as the axis. I've typically run Sealion in earliest of the spring 1941 and held off Barbarossa til 42. Just curious has anyone conducted Sealion prior to 1941? What is the earliest anyone has landed?

lots of Sealions start in 1940, just depends on how fast France falls, it can be as early as April if the weather is helpful

What's a good mix of units for Sealion?

If you plan doing it, what should you build?