Most lethal American battles Battles Battles

| Battle_Siege_or_Offensive | Conflict | Dates | Estimated_number_of_Americans_killed_ |
|---|---|---|---|
| Battle of Belleau Wood | World War I | June 1 to June 26, 1918 | 1,811 killed |
| Battle of Peleliu | World War II | September 15 to November 27, 1944 | 1,794 killed |
| Second Battle of Guam | World War II | July 21 to August 8, 1944 | 1,747 killed, |
| Battle of Tarawa | World War II | November 20 to November 23, 1943 | 1,677 killed |
| D-day (first day of Operation Overlord) | World War II | June 6, 1944 | 1,465 killed |
| Battle of Chosin Reservoir | Korean War | November 27 to December 13, 1950 | 1,029 killed |
| Battle for Manila | World War II | February 3 to March 3, 1945 | 1,010 killed |