Amongst some of the first, were the wars against the Mongols of Kubla Khan in 1274 AD.
First Sino-Japanese War happened on 1894-08-01.
PENHETA
russo-japanese war
The Japanese first attacked at Pearl Harbor Hawaii.
Japanese
The First or Second Sino-Japanese War.
"War" is not a Japanese word. In Japanese, "war" is 戦争 (sensou).
Japan's first war, after it's industrial revolution in the 1860's, was against China; called the 1st Sino-Japanese War of 1894.
Possibly the POW Camp in Bataan, as that was one of the first POW camps for the allies, and one of the first experiences for Japanese forces on the handling of Prisoners of War.
Some historians refer to the 1930's invasion of China by Japan, as the 2nd Sino-Japanese War. The first was in 1894.
First the Japanese in 1592, then the North Koreans which triggered the Korean War.
"Issei" .