28th Massachussetts Irish Volunteer Infantry

155th New York Volunteer Infantry
"The original 155th NY was an Irish regiment, recruited largely in Western New York, that served in the Army of the Potomac during the Overland and Petersburg campaigns. The unit was part of an all-Irish brigade known as the Corcoran Legion, which was one of only two Irish brigades in the Federal army."

IRISH DRAGOONS
"The Irish Dragoons are a mounted and dismounted cavalry regiment. Raised illegally in 1863 by Gen. John C. Fremont, the Irish Dragoons suffered a short but brave life. The men of the Reactivated Irish Dragoons mounted & dismounted cavalry, U.S. strive to portray as authentically as possible the valour and courage of those men.

The Fighting 69th
69th New York State Volunteers, Company A, First Regiment, Irish Brigade "Faugh A Ballagh"

Irish Green & Union Blue
IRISH BRIGADE PRINTS BY TROIANI, KUNTSLER, REEVES, 69TH FLAGS & BOOKS
"Our Shop is a dealer for IRISH BRIGADE CIVIL WAR PRINTS by artists TROIANI, KUNTSLER, REEVES, GALLON and also carries FLAGS of the IRISH BRIGADE. A large collection of CIVIL WAR BOOKS and ARTIFACTS are available.

THE IRISH BRIGADE ASSOCIATION
"Our organization is dedicated to the memory of the millions of brave Irish men and women who have fought on every continent and helped build nations around the world. We have a special affection for those who fought in the American Civil War -- both North and South"

Songs of the Irish Volunteer
Songs of the Irish Union Soldier 1861-1865

Irish at the Battle of Gettysburg

Some additional excellent resources for your research are: