INvasion
The invasion started in 1931 where the Japaneses invade Manchuria southern part, well the league of nations did not do nothing to take back Manchuria so it was a successful victory for Japan. The reasons of its invasion was because Manchuria was a large country and they could easily fit the over-population of japan and take its resources. The Japanese then started bombing cities in the norther part of China. The invasion to china begin in 1937 in the Lugou bridge also called "The battle of Lugou bridge" or refereed as the Marco polo bridge incident. Well the Chinese forces did not effectively resisted the Japanese army because they weren't industrialize and well equipped, unlike the Japanese. The Japanese army was also very brutal, in the raping of Nanking was the event when Japanese massacre Chinese with no mercy. After loosing the the battle of Lugou bridge, Chiang Kai-Shek the general that lead china into defending itself from the Japanese army invasion had no choice but to send a big part of its army to defend Shanghai after seeing the results in the Marco polo bridge and Tianjin city. He had to defend shanghai. The Japanese were surprised at Shanghai because the Chinese army were organized and well equipped. Because of that the Japanese had a hard time fighting . Unfortunately their efforts were not enough because after some time Japanese reinforcements came and took over Shanghai.