What is the historical allusion of "looking at plum to quench thirst" and which historical figure is it about?

Looking at plum to quench thirst is an allusion in the late Eastern Han Dynasty. It tells the story that Cao Cao once led troops to fight in person. The weather was hot on the way, and the soldiers were sweating profusely. There was no water on the way, and the soldiers were very thirsty. When Cao Cao saw it, he was afraid of military chaos, but he did not disturb the clever Cao Cao. Cao Cao ordered his men to send a message to the soldiers, telling them: "There is a large piece of Meilin not far ahead, bearing many plums, which are sweet and sour and very thirst-quenching." Hearing this, the soldiers' morale was greatly boosted, and they all cheered up and accelerated their March. With Cao Cao's ingenuity, he was finally able to reach the place where there was water ahead.

The historical figure of this story is Cao Cao, a very famous figure from the end of the Eastern Han Dynasty to the Three Kingdoms period, and also a famous politician, strategist, writer and poet in the history of China. Cao Cao's life is enviable. Although it was a life of war, Cao Cao began to suppress the yellow turban insurrectionary uprising and gradually developed into a hegemon. His Cao Cao "relied on the emperor to make the princes", accelerated the pace of unifying the north, and defeated Yuan Shao, who had an army of 100 thousand, with clever ingenuity in the battle of Guandu, and completed the reunification of the north.

Later, Cao Cao's influence in the north was unstoppable, forming a tripartite confrontation with Shu and Wu. Cao Cao loved talents all his life, and both literary talents and military commanders were deeply influenced by Confucianism.

Cao Cao is a man who knows the art of war. He is familiar with the military works of Sun Wu, Wu Qi and others, and is very good at combining his own forms. He is flexible in strategy and tactics, can win in any situation, and is disloyal in the war. Enemies will be afraid of him when they see him, and Cao Cao is also a great poet, leaving many well-known poems.