READING (Invasion of Poland)

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Across
  1. 1. Country German forces launched surprise attack on
  2. 5. Forces launched surprise attack on Poland in 1939
  3. 7. Word means "lightning war"
Down
  1. 2. Destroyed the Polish air force in days
  2. 3. Type shelling attack on Poland was sounded with
  3. 4. Group attacked from Pomerania
  4. 6. Forces were deployed too close to German frontier