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  "name": "Battle of the Atlantic",
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  "traits": [
    "Ace of Spades closes the Channel chapter. The Margin Ace begins with a readable fan, then spreads the ink wider. The convoy context connects the page’s open route to a larger idea: avoiding danger can preserve something valuable.",
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      "date": "2026-10-30",
      "text": "Added from the named source to the Field Guide."
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  "spoilers": [],
  "questions": [
    "Could codebreakers read every naval message throughout the war? No. Enigma procedures and equipment changed. Interruptions in Allied reading meant that intelligence advantages could disappear and had to be rebuilt."
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