Because if an enemy got into the trenches, theycould stand at one end with a gun and fire continuously and wipe out everyone, having zig zags helps prevent this! The trenches were also zig-zagged because if an enemy shell landed in the trench, it could wipe out a whole platoon if the trench was straight!
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Front-line trenches were not dug in straight lines. Otherwise, if the enemy had a successive offensive, and got into your trenches, they could shoot straight along the line. The French tended to build zig-zag trenches. However, the British Army preferred a system where each trench was dug with alternate fire-bays and traverses. Whereas fire-bays were straight sections of trenches, traverses were built at angles. This limited the effect of enfilade fire or shell-burst
they fought in the trenches ww1 was known as a war in the trenches
Trenches in WWI extended about 400 miles.
It changed war in the trenches because
the trenches first started in 1914, the start of world war 1.