This is the most complete list of the battles I know of. If something is missing that you feel is important, please e-mail me with the suggestion. The list includes the major battles and most of the medium ones. Begins in April 1861 and ends May 26, 1865. Enjoy.
1861
April 12-Bombardment of Fort Sumter(SC)
July 21-First Battle of Bull Run(Manassas, VA)
August 10-Battle of Wilson's Creek(MO)
October 21-Battle of Ball's Bluff(VA)
November 7-Battle of Belmont(MO)
1862
January 19-Battle of Mill Springs(Ky)
February 6-Fight for Fort Henry(KY)
February 16-Fight for Fort Donelson(KY TN?)
March 7-8-Battle of Pea Ridge(AR)
March 9-Battle of The Merrimack and the Monitor
March 23- Battle of Kernstown(VA)(Valley Campaign)
April 6-7-Battle of Shiloh(TN)
May 8-Battle of McDowell(VA)
May 23-Battle of Front Royal(VA)
May 25-First Battle of Winchestor(VA)
May 31-June 1-Battle of Seven Pines(VA)
June 8-9-Battles of Cross Keys and Port Republic
June 25-July 1-Seven Days Battle(VA)
August 9-Battle of Cedar Mountain(VA)
August 29-30-Second Battle of Bull Run(VA)
September 14-Battle of South Mountain(MD)
September 15-Jackson captures Harpers Ferry(VA)
September 17-Battle of Antietam(MD)
September 19-Battle of Iuka(Miss)
October 4-Battle of Corinth(Miss)
October 8-Battle of Perryville(Ky)
December 13-Battle of Fredricksburg(VA)
December 31-Battle of Murfreesboro(TN)
1863
May 1-Battle of Port Gibson(Miss)
May 1-4-Battle of Chancellorsville(VA)
May 12-Battle of Raymond(Miss)
May 18-July 4-Seige of Vicksburg(Miss)
July 1-3- Battle of Gettysburg
September 19-20-Battle of Chickamauga(GA)
November 24-25-Battles of Lookout Mounatin and Missionary Ridge(TN)
1864
February 20- Battle of Olustee(FL)
March 13-May ?-Red River Campaign(LA)
May 5-6-Battle of The Wilderness(VA)
May 8-21- Battle of Spotslvania(VA)
May 13-Battle at Resaca(GA)
May 15-Battle of New Market(VA)
May-25-29-Battle at New Hope Church(GA)
June 1-3-Battle of Cold Harbor(VA)
June 10-Battle at Brice Crossroads(Miss)
June 18-Seige of Petersburg begins(VA)
June 27- Battle of Kennesaw Mountain(GA)
July 15-Battle of Tupelo(Miss)
July 20-Battle of Peachtree Creek(GA)
July 22-Battle of Atlanta(GA)
July 30-Battle of the Crater(VA)
August 1-Battle of Mobile Bay
September 2-Sherman occupies Atlanta(GA)
September 19-Second Battle of Winchestor(VA)
October 19-Battle of Cedar Creek(VA)
October 19-CSA raiders attack St. Albans(VR)
Nobember 15-Sherman's March to the Sea begins
November 30-Battle of Franklin(TN)
1865
March 19-Battle of Bentonville(NC)
April 1-Battle of Five Forks(VA)
April 2-Grant takes Petersburg and Richmond(VA)
April 6-Battle of Saylor's Creek(VA)
April 9-Lee surrenders ANV at Appomattox(VA)
April 14-Lincoln killed
April 26-Johnston surrenders to Sherman in Durham(NC)
May 4-Taylor surrenders last army east of Miss. River
May 13-Last battle of the war at Palmito Ranch(TX)
May 26-Smith surrenders CSA Trans-Mississippi Army, ending the Civil War.
Continue to The Armies