The Round-Robin Letter is the name of an incident in the United States Army that occurred between July 28 and August 3, 1898, during the Spanish–American War. After disease incapacitated thousands of Army soldiers in the wake of the Siege of Santiago, high-ranking officers of Fifth Army Corps drafted a round-robin letter demanding that the unit be sent back to the United States. Public release of the letter embarrassed the U.S. government.