On April 23, 1861, a few days after the fall of Fort Sumter, he left New York with the Sixty-Ninth as Captain of Engineers. He was present at the battle of Blackburn’s Ford, July 18th, and Bull Run July 21st, where he was severely wounded. After this battle Acting Brigadier-General T. F. Meagher recruited the celebrated Irish Brigade, and he was commissioned Major of the Eighty-Eighth New York Infantry, one of the regiments of that organization, in 1861, and ordered by General Meagher to proceed to Fort Schuyler and take command there until further orders. (As far as we know, he was the first volunteer officer to take command of a Fort in the Civil War.) He was present in all the battles of that famous Brigade in the Peninsular Campaign and commanded the regiment all through the Seven Days’ fighting. He won his Medal of Honor by leading a charge on a Confederate battery at Savage Station, Va., June 29, 1862. The battery in question was one of six guns, and had been very annoying to the Union troops. Several other regiments had made efforts to silence it, but without avail. General W. W. Burns, U. S. A., who was in command on that memorable day, wrote at the time Major Quinlan received his Medal of Honor as follows: “The Medal of Honor won by your gallant charge which silenced the enemy’s battery at Savage Station and closed that desperate attack upon the rear of the Army of the Potomac, June 29, 1862, is a just reward and memento for conspicuous bravery due from a grateful Republic to the brave leader of the gallant Eighty-Eighth New York. No one can feel more satisfaction for this signal proof of distinction and glory than your old Commander of that day. The Eighty-Eighth saved the lives of many gallant soldiers by that forlorn-hope charge, and cleared our way to victory that day. It commemorated the charge of the Irish Brigade at Fontenoy.” In the Circular “Medals of Honor” issued by the War Department October 31, 1897, the ground of award of Major Quinlan’s medal is as follows: “Led his regiment on the enemy’s battery, silenced the guns, held the position against overwhelming numbers, and covered the retreat of the Second Army Corps.” He was honorably mentioned by General McClellan for bravery at Malvern Hill and Antietam. He was commissioned Lieutenant-Colonel on September 22, 1862, and received his honorable discharge for disability on medical certificate February 4, 1863. After a few weeks’ illness of heart trouble he died at his home, 104 East 96th Street, August 29, 1906. And so has passed into history the name of a citizen of foreign birth, who owed allegiance to the whole of his adopted country, and when her troubles came he was found early at the front, dedicating his all to her perpetuity. A firm, honest friend, a devoted Christian, a loyal brave soldier went to his rest when James Quinlan joined the soldiers of our great Republic who had gone before.