Artillery barrage could be heard for hundreds of miles.
Along with exploding mines it created immense noise. In 1917, explosives blowing up beneath the German lines on Messines Ridge at Ypres in Belgium could be heard in London 140 miles (220 km) away.

Artillery barrage could be heard for hundreds of miles.
Along with exploding mines it created immense noise. In 1917, explosives blowing up beneath the German lines on Messines Ridge at Ypres in Belgium could be heard in London 140 miles (220 km) away.

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