Atomic bombings of Hiroshima and Nagasaki
Patti arrived in Hanoi on a mercy mission with an OSS agent, Carleton B. Swift, and a French government official, Jean Sainteny. His primary mission was to assist in the repatriation of allied prisoners-of-war, as the U.S. government feared reprisals against them by the Japanese after the Atomic bombings of Hiroshima and Nagasaki. His secondary mission was to gather intelligence.