Army groups of the National Revolutionary Army

The army groups (Chinese: 集團軍, also translated as group armies) of the National Revolutionary Army were the largest conventional mobile formations in the organization of the army of the Republic of China during the Second Sino-Japanese War. The first army groups were established immediately after the Japanese attack at Marco Polo Bridge on 7 July 1937, and new army groups continued to be formed throughout the war.

Source: Wikipedia — Army groups of the National Revolutionary Army (CC BY-SA 4.0)