The greatest attrition rate of Gettysburg was on the second day by the First Minnesota at 82%, in fact, it is the highest of the entire Civil War; this charge was described by President Calvin Coolidge in his speech: "The story of Col. William Colvill and the First Minnesota Volunteer Infantry is too well known to need extended repetition. When President Lincoln called for volunteers to prevent the dissolution of the Union, this was the first regiment offered. It gave valiant service upon many a resolutely contested field, but its most conspicuous record was made at Gettysburg on the second day of that decisive battle. When the forces under the command of General Sickles advanced into action a little after noon, the First Regiment, of which only eight companies were present, numbering 262 men, took the position they vacated. The overwhelming forces of the Confederates under Longstreet and Hill repulsed and drove back the command of General Sickles and were advancing on the left flank of the Union Army, which was in grave danger of being rolled up in defeat. It was at this juncture that General Hancock ordered this depleted regiment to charge the advancing Confederates.
The gallant First Minnesota, led by Colonel Colvill, at once responded with an impetuosity that broke the first and second line of the enemy and stopped the advance. When the action was over but 47 men of the 262 who began the charge were still in line. The remaining 215 lay dead or wounded on the field. In all the history of warfare this charge has few, if any, equals and no superiors. It was an exhibition of the most exalted heroism against an apparently insuperable antagonist. By holding the Confederate forces in check until other reserves came up, it probably saved the Union Army from defeat. What that defeat would have meant to the North no one can tell. Washington, Philadelphia, New York, and the whole heart of the North would have been open to invasion, and perhaps the Union cause would have been lost. So far as human judgment can determine, Colonel Colvill and those eight companies of the First Minnesota are entitled to rank as the saviors of their country."