What is the historical event of China Brothers?

The first cooperation between the Kuomintang and the Communist Party was the Northern Expedition, with the aim of eliminating warlords and powers. There can be no Japanese devils and the New Fourth Army.

The second cooperation was that after the peaceful settlement of the Xi Incident, the Kuomintang and the Communist Party cooperated to resist Japan.

Only in this way will the Kuomintang and the Communist Party unite to fight the devils.

The Red Army was reorganized into the Eighth Route Army of the National Revolutionary Army (also known as the Eighth Route Army) and the newly compiled Fourth Route Army of the National Revolutionary Army (also known as the China New Fourth Army Brothers Company), so it should be after the second historical event of Kuomintang-Communist cooperation.