It varied. The trenches stretched for more than 450 miles, from the North Sea to the Swiss border. Normally the opposing trenches were 200-400 yards apart. In some places though, they were much closer. And in other places as much as half a mile of "no man's land" separated the opposing trench systems. The average distance of 200-400 yards was well within rifle range of the enemy.
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so that soldier could rest and hide from enemies since there are many soldiers
No. Trenches were used in wars as far back as history is recorded. Trenches were used in the Revolutionary war in the US. Some of these trenches can still be seen at the scene of some battlefields such as Gettysburg, Pennsylvania and Yorktown Virginia.
as far as Switzerland
The idea of trench warfare after WWI was mostly obliterated by WWII because of Allied advances of fighting in trenches. The biggest reason trenches were less widely used, is because modernized tanks of WWII were able to cross trenches far better than those used in WWI.
from 7 feet to 8