Why Gen. John Pershing avoided trench warfare during World War I?
He knew it was a dead end strategy, when the U.S. entered the war it had already been going on for basically 2 years. The French and the British wanted to use his troops to replace their loses in the trenches and he knew that it would just use up his men. So he kept the Expeditionary Force together as a unit as much as possible to make sure they wouldn’t be misused.