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Does an army initiating a battle have to be in supply to do so? And is that specific case checked before the battle rather than reviewing all pieces' supply in the "Supply check" stage?
Page 18: To battle a Land space, you must have a supplied Hoplite or Trireme adjacent to the space battled
(the same for sea battles, but you need Triremes).
And page 14: you must check the supply status of a piece when you muster, when you battle, during the supply step...
It's all in there...