World War I

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Across
  1. 3. Archduke Ferdinand was the heir
  2. 5. urged to attack the US in a German Note
  3. 7. Treaty that ended the War
Down
  1. 1. weapon first used used in Somme Battle
  2. 2. the city of Ferdinands assassination
  3. 4. seize fire or stop the battle
  4. 6. pandemic that threatened soldiers
  5. 7. missiles fired by submarines
  6. 8. formal friendship between nations