Irish-American Catholics served on both sides of the American Civil War (1861–1865) as officers, volunteers and draftees. Immigration due to the Irish Great Famine (1845–1852) had provided many thousands of men as potential recruits although issues of race, religion, pacifism and personal allegiance created some resistance to service. In addition very large numbers of Scots-Irish Protestants were involved in the work, especially the Confederacy.