The imprisonment of missionaries who had illegally entered the country was the primary pretext for the French to invade and occupy Indochina.

Their persecution of missionaries was the primary pretext for the French to invade and occupy Indochina.

In early January 1941, Thailand invaded French Indochina, beginning the French-Thai War.

In 1940 Japan invaded French Indochina in an effort to embargo all imports into China, including war supplies purchased from the U.S.

In 1940, Japan invaded French Indochina in an effort to control supplies reaching China.

In 1940, the Empire then invaded French Indochina, after which the United States placed an oil embargo on Japan.

In 1940, during the second World War, coinciding with their ally Germany's invasion of France, the Japanese invaded French Indochina.

During World War II, Imperial Japan invaded French Indochina and seized control.

The military history of the Socialist Republic of Vietnam began when Japan invaded French Indochina and soon defeated the French resistance.

During the 1940s, Imperial Japan invaded Indochina and seized control from France.