Organized at madison, wisconsin, and mustered in september 2, 1861. . Left state for washington, d.C., september 21. The unit would see exclusive service as part of the iron brigade in the eastern theatre.Service: duty in the defences of washington, d.C., till march, 1862. Advance on manassas, virginia., march 10-16., advance to falmouth april 9-19. Operations against jackson june 2-11, reconnaissance to orange court house july 24-27,. Reconnaissance to frederick’s hall station and spotsylvania court house august 5-8., thornburg’s mills (or massaponax church), battle of cedar mountain august 9. Pope’s campaign in northern virginia august 16-september 2. Fords of the rappahannock august 21-23. Action at gainesville august 28, battles of groveton, bull run, chantilly, maryland campaign, battles of south mountain, maryland., september 14, antietam, advance to falmouth, virginia, fredericksburg, mud march, expedition to heathsville february 12-14, chancellorsviile campaign, operations at pollock’s mill creek, fitzhugh’s crossing, chancellorsviile, gettysburg (pa.) campaign, june 11-july 24,.Gettysburg, haymarket, mine run campaign, campaign from the rapidan to the james river may 4-june 15, 1864, wilderness, laurel hill, spotsylvania, spotsylvania court house, bloody angle, north anna river, jericho ford, cold harbour, bethesda church siege of petersburg june 16, 1864, to april 2, 1865, weldon railroad, boydton road, hatcher’s run, dabney’s mills, hatcher’s run, appomattox campaign march 28-april 9,. Lewis farm, boydton and white oak roads, five forks, appomattox court house. Regiment lost during service 10 officers and 271 enlisted men killed and mortally wounded and 143 enlisted men by disease, a total of 424. The second issue of flags were made by gilbert hubbard & co of chicago. The unit received the flags in june 1863. The national flag is adorned with numerous battle honours and, bears the unit designation. The state or regimental flag has a blue field with a gold fringe upon the flag is the wisconsin state seal and, the national arms on the reverse. Below the seal and national arms are red scrolls, with the unit designation, in gold.