heavy artillery

noun
1.
guns and howitzers of large caliber.
2.
guns and howitzers of 155-mm caliber and larger. Compare light artillery ( def 2 ), medium artillery.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Heavy artillery is becoming an increasingly important factor in deciding
  battles.
Some told harrowing tales of their confinement for weeks under heavy artillery
  fire.
Compared with a tank or heavy artillery, they represent a tiny and easily
  hidden target.
All the heavy artillery of conservatism was there, and the participants were
  speaking to their own.
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