Most lethal American battles Battles Battles

| Battle_Siege_or_Offensive | Conflict | Dates | Estimated_number_of_Americans_killed_ |
|---|---|---|---|
| Meuse-Argonne Offensive | World War I | September 26 to November 11, 1918 | 26,277 killed |
| Battle of the Bulge | World War II | December 16, 1944 to January 25, 1945 | 19,276 killed |
| Battle of Normandy | World War II | June 6 to July 24, 1944 | 16,293 killed |
| Battle of Okinawa | World War II | April 1 to June 21, 1945 | 12,513 killed |
| Battle of Hürtgen Forest | World War II | September 19, 1944 to February 10, 1945 | Over 12,000 killed |
| Battle of Gettysburg | American Civil War | July 1 to July 3, 1863 | 7,863 killed (3,155 Union and 4,708 Confederacy) |