The Largest Army is a special card included in Catan and is worth 2 Victory points to the holder. The first player to play 3 Knight cards may claim the Largest Army. If another player plays more Knight cards they may claim the Largest Army card from the original player and likewise are awarded 2 Victory points.
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Largest Army is not used in Catan: Cities & Knights, or Catan: Explorers & Pirates and several official scenarios.