In regard to your first question, yes. If you look under transports in your rules you’ll learn about something called bridging; you can amphib. assualt europe directly from the UK. The attacker would take the convoy centre even if the submarine is submerged (of course they would needa war ship to take it). Blitzingis a special combat move reserved for tanks. They can move through an enemy controled territory (that is one without enemy units), gain control of it them selves an continue on to a friendly territory, another enemy controled territory (gaining control of it too), or it can move on to take part in a regular battle. Hope this helps you out, and may your country of choice rule the world.