When I was in Taiwan, Chiang's regime controlled the media so people could not know the true history of China and Taiwan. The truth is as following: KMT founder Dr. Sun adopted CCP in exchange of the Russia's weapon supply for his northren expedition.  Before April 12 1927, Chiang turned his gun to his northren expedition partner CCP, Mao was enjoying a higher social rank than Chiang due to his talent in the literature. So Mao was an intellectural and Chiang was not and might be a member of mafia.  Chiang married Song Mie-Ling in November 1927 seven months later because he knew Russia would not support him anymore and he needed his wife to get support from United States. And Mao was on the run to escape KMT's capture and kill (Mao was captured once then he was able to escape to safety) when Chiang was enjoying his new young wife.

Chiang tried to destory Mao and Zhu De's CCP in 井崗山five times.  The first three times Chiang was defeated even he had three times more army than Mao. Mao was not in charge of the army for the fourth and fifth times. So CCP was defeated (Chiang hired Germany consultant) and began to run for another base. This is so called 25000 kilmeter long march. Mao was able to find a new base. During the expedition,  Mao's body guard covered him up and saved his life from a bomb dropped by KMT airplane.  The bomb killed his body guard instead of him.

The reason of northren expedition victory was not because Chiang knew how to fight the war but because he used money to corrupt the subordinates of those northren warlords. Then these warlords were not able to fight Chiang due to the resistance of their soliders.

The Xi-An（西安事變） coup event happened in 1937, Russia instructed CCP not to kill Chiang because WWII needed China to fight Japan. So Chiang escaped being killed in exchage of adopting CCP to join the anti Japan war and his son's return from Russia.

During the anti Japan war Mao with the help from Russsia, in spite of Chiang's confinement, gained a lot of army by winning some anti Japan war.  And Chiang also won some war by the help of US, his wife was welcome to deliver a speech in US assembly in 1943.

But after the WWII, Mao's CCP was able to win the three important wars （平津战役，淮海战役，辽沈战役）againest KMT at the north of Chang-Jian river（長江以北）.  Chiang again tried to send his wife to get help from US to defeat CCP (not Japan this time) at the end of 1948. His wife only got 30 minutes with US president Truman and was refused for any help. Truman refused to give Chiang any help because Truman called Chiang a warlord. Truman knew Chiang ordered his army to  kill a lot of people both at China and Taiwan and was not a good leader.

Mao was able to kick Chiang out of China at the end of 1949. To me, Mao was a Chinese emperor and Chiang was just a warlord.