Even 100 years after the United States’ entry into the war to end all wars, Army 1st Lt. Charles Stewart’s letters to his wife — found years ago in a trunk in the attic of a Denver home — still evoke vivid snapshots of a relatively short but bloody chapter in history. “Well, 2:30 to a second this morning hell opened up, and the earth trembled as thousands of guns began vomiting their tons of death and destruction,” Stewart wrote on Sept.