A soldier's guide to the trenches

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Across
  1. 4. Pioneers who dug saps and cleared wire under enemy fire.
  2. 7. Infection from standing in cold wet boots for days, turning toes gangrenous.
  3. 9. Lice fever, dysentery and gangrene plagued men in filthy conditions.
  4. 10. Hours of screaming shells that buried squads alive in mud.
Down
  1. 1. Night attacks across no man's land to grab prisoners or intel.
  2. 2. Zig-zag lines of earth that froze the front from Switzerland to the sea.
  3. 3. Slatted planks keeping your feet above trench swamp water.
  4. 5. High-explosive barrages turned no man's land into moon craters.
  5. 6. Steel Stahlhelm shielding your skull from shrapnel rain.
  6. 8. Cat-sized corpse-feeders stealing rations from sleeping men.