Russia campaign exposes invasion-tonnage mechanics

Spain's collapse ends one invasion and shifts attention to Estonia, southern Finland, and central Russia. The game rewards concentrating far more naval tonnage than the defence can match, producing near-certain invasion odds even for geographically implausible objectives. Mutually supporting fleets give Britain control of the approaches to the Russian targets. The joke about invading a continental landmass from its middle exposes both the value of concentration and the campaign model's loose treatment of geography.