First Sino-Japanese War
Seoul, South Korea
According to the Japanese, the Qing government had violated the Convention of Tientsin by not informing the Japanese government of its decision to send troops, but the Qing claimed that Japan had approved this. The Japanese countered by sending an 8,000-troop expeditionary force (the Oshima Composite Brigade) to Korea. The first 400 troops arrived on June 9 en route to Seoul, and 3,000 landed at Incheon on June 12.