@andrewaagamer I have not heard of such a document, but that doesn’t mean it doesn’t exist.
Naval Bombardment
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When a Cruiser or Battleship bombards the coast on an amphibious assault, is that unit subject to fire from the defending units?
As an example, if a territory had a group of ten tanks and the opponent decided to invade with 2 infantry and 2 battleships, are the battleships at risk?
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No - land units cannot fire at the ships. The ships only fire once and are then no longer involved in the battle.