Biên Hòa
Biên Hòa grew into a major suburb of Saigon as the capital city of the Republic of (South) Vietnam grew. Following the First Indochina War, tens of thousands of refugees from the northern and central regions of Vietnam—a large portion of whom were Roman Catholics—resettled in Biên Hòa as part of Operation Passage to Freedom. During the Vietnam War, the United States Air Force operated Biên Hòa Air Base near the city. Mortar attacks on U.S. and ARVN targets were frequently staged from residential districts in Biên Hòa. Two of the better-known attacks took place during Tết of 1968 as well as 1969.