If you're interested in figuring out how your Maine ancestor spent his Civil War service, there are dozens of regimental histories and other resources online that won't cost you a penny.

To determine which unit(s) your relative served with, try the NPS Civil War Soldiers & Sailors System. Then, for a quick overview of each unit's service, see the Maine State Archives' Summary Unit Histories & Related Materials. Then delve into the Civil War bookshelves:

• History of the First-Tenth-Twenty-ninth Maine regiment
• History of the Fifth regiment Mane volunteers
• Campaigning with the Sixth Maine : a paper read before the Iowa Com...
• History of the Seventh Maine Light Battery
• The story of one regiment; the Eleventh Maine infantry volunteers i...
• Roster and statistical record of Company D, of the Eleventh regimen...
• History of the Thirteenth Maine regiment from its organization in 1...
• Fourteenth Reg't., Maine Infantry, roster of survivors with abstrac...
• The story of the Maine Fifteenth
• The Sixteenth Maine Regiment in the War of the Rebellion, 1861-1865
• Company D, 16 Maine vols. A brief history of the individual service...
• The campaigns of the Seventeenth Maine
• The history of the Nineteenth regiment of Maine volunteer infantry,...
• Reunions of the Twentieth Maine regiment association at Portland
• Army life; a private's reminiscences of the civil war (20th Infantry Regiment)
• Historic record and complete biographic roster, 21st Me. Vols. with...
• The Thirty-second Maine regiment of infantry volunteers; an histori...
• My recollections of the war of the rebellion (23rd Infantry Regiment, 1st Mounted Artillery Regiment, 7th Battery)
• History of the First Maine cavalry, 1861-1865
• First Maine Bugle (1st Cavalry Regiment) (vols. 2-3, vols. 4-5)
• History of the Fourth Maine battery, light artillery, in the civil ...
• The First Maine heavy artillery, 1862-1865
• Letter to the members of the 5th Maine battery association
• Maine at Gettysburg
• Brief sketch of the battle of Gettysburg; introduction to Maine at ...
• East Maine conference seminary war record
• Bowdoin in the War
• Maine in the war for the Union: a history of the part borne by Main...
• Appendix "D" of the Annual report of the adjutant general of the st...
• The War of the Rebellion: a Compilation of the Official Records of ...
• Official Records of the Union and Confederate Navies
• List of pensioners on the roll January 1, 1883
• Roster of All Regimental Surgeons and Assistant Surgeons in the Lat...
• Supplement to the Annual reports of the Adjutant General of the sta...
• Returns of desertions, discharges, deaths, etc., in Maine regiments...