WW1 Technological Upgrades

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Across
  1. 6. trench defense
  2. 7. a poisonous gas, it shares a name with the condiment
  3. 9. internally drowning
  4. 10. popular Bruno Mars song
Down
  1. 1. sandwiched between enemies
  2. 2. "bark bark!" *swerves plane*
  3. 3. like putting a lighter to hairspray
  4. 4. they share a name, but its not the food
  5. 5. _______ warfare
  6. 8. flattens enemy fortifications (also hulk in marvel rivals)