Weaponry and How The War Ended - WW1 vs WW2

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Across
  1. 1. Deadly bombs dropped on Hiroshima and Nagasaki (6 letters)
  2. 4. Aerial battles between planes (8 letters)
  3. 6. Massive artillery caused many casualties in this war (3 letters)
  4. 7. Weaponized vehicle introduced by the British in WWI (5 letters)
  5. 9. The war tactic involving rapid and overwhelming force used in WWII (10 letters)
Down
  1. 1. These replaced battleships as the most important naval asset (14 letters)
  2. 2. The treaty that ended WWI (11 letters)
  3. 3. First poison gas used in warfare (6 letters)
  4. 5. Armistice Day marks the end of this war (3 letters)
  5. 8. German submarine that disrupted shipping lines in both wars (7 letters)