Haiphong Incident

The Haiphong Incident or the Haiphong Massacre occurred on November 23, 1946, when the French cruiser Suffren and several avisos bombarded the Vietnamese coastal city of Haiphong, killing between 2,000 and 6,000 Vietnamese. On December 2, the city was completely seized by the French. The incident, also known as the Shelling of Haiphong, is thought of as the first armed clash in a series of events that would lead to the Battle of Hanoi on December 19, 1946, and with it the official outbreak of the First Indochina War.

Conflict over customs control and sovereignty.