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Glowworms (more specifically European glowworms) were used in jars there were thousands were used to help soldiers and officers study maps read letters and read intelligence reports. They emit light through bioluminescence  Just  10 glowworms can have the same illumination as a modern roadway light.  

So in short: They were used for lighting

  • When Glowworms (are more specifically when European glowworms) were used in jars there were thousands were used to help soldiers and also that officers are studying with maps read letters and also they read intelligence reports. after that,
  • They emit light through bioluminescence Just because 10 glowworms can have the same illumination as a modern roadway light.

        When They were used for lighting

  • When The Soldiers in the First World War spent a lot of time in trenches and also that tunnels.
  • But They could not use lanterns at night just because the enemy would see them.
  • So After that soldiers were used glow worms to read important messages that are the maps in the dark. scared them.

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