Nomonhan Incident

Second Sino-Japanese War

East Asia 1939.0831

Nomonhan Incident

Second Sino-Japanese War, Japan-China War, Rape of Nanking (31 August 1939)

Historical Map of East Asia & the Western Pacific

A second Soviet-Japanese dispute broke out on the Mongolian border in May 1939, culminating in the Soviet defeat of Japanese forces at Nomonhan in August. At the same time, the Soviets signed the Molotov-Ribbentrop Pact, a non-aggression treaty with Japan's erstwhile ally Germany.

Main Events

Japan occupies Hainan Island

Japan occupies Spratly Islands

Battles of Khalkhin Gol

Border clashes between Japanese troops in Manchukuo and Soviet Union, culminating in Japanese defeat at Nomonhan

Siam becomes Thailand

In the first of a series of Cultural Mandates issued by the government of Field Marshal Plaek Pibulsonggram during his first period as Prime Minister and military dictator, the Kingdom of Siam is officially renamed as the Kingdom of Thailand. From now on in English, the country is called 'Thailand' and the people called 'Thai'.

Molotov-Ribbentrop Pact signed

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