A piece of Wood

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Across
  1. 2. with nobody else
  2. 3. a barrier at the entrance to a building, room, vehicle...
  3. 6. a hard, strong grey alloy of iron and carbon and usually other elements, used as a structural and fabricating material.
  4. 8. fine, dry powder consisting of tiny particles
Down
  1. 1. a state of armed conflict between different countries or different groups within a country.
  2. 4. person in authority (.. in charge for, responsible for..)
  3. 5. a state or period in which there is no war or a war has ended.
  4. 6. hurt or kill (with a gun, rifle..)
  5. 7. a weapon incorporating a metal tube from which bullets, shells, or other missiles are propelled by explosive force