Group 1 - The New Fourth Army was established in late 1937 and grew from over 10,000 to more than 250,000 troops by the end of the war, engaging in 24,600 battles against 160,000 Japanese and 230,000 puppet troops [1][3] - The army was formed through the collaboration of the Communist Party and the Nationalist Party, with key leaders including Ye Ting and Xiang Ying [3][4] - The New Fourth Army adopted a strategy of guerrilla warfare, focusing on attacking Japanese forces wherever they were located, as directed by the Communist Party [6][7] Group 2 - The New Fourth Army faced challenges in adapting from guerrilla warfare to conventional battles, necessitating the establishment of new military units, including waterborne and cavalry forces [7][10] - The army successfully created its first naval unit, the Suzhong Coastal Defense Regiment, in early 1942, which later became part of the East Sea Fleet [8] - The cavalry unit, led by Peng Xuefeng, was notable for its size and effectiveness, utilizing captured Japanese steel to create a feared weapon known as the "Xuefeng Knife" [10] Group 3 - Following the "Wannan Incident," the New Fourth Army faced financial difficulties as the Nationalist government ceased funding, prompting the need for economic development to support military operations [11] - The Seventh Division of the New Fourth Army established a trade management bureau in Anhui, which significantly improved the economic conditions and provided substantial financial support to other units [11][12] - The phrase "Second Division has many people, Fourth Division has many horses, Seventh Division has much money" became popular, highlighting the strengths of different divisions within the army [12] Group 4 - The New Fourth Army established local governance in areas they controlled, with the first county government set up in Dingyuan County, showcasing their administrative capabilities [12][14] - By the end of 1941, the New Fourth Army had established numerous administrative bodies, including 12 administrative offices and over 2,700 township governments, serving a population of 15 million [14] - A unique voting system was implemented in rural areas, allowing illiterate farmers to participate in elections through a simple bean voting method, which was later documented by foreign journalists [14]