Long jokes about Chinese characters

Once, when the Huns from the north were about to attack the Central Plains, they sent someone to deliver a "battle list" first. The emperor opened it and took a look. It turned out to be the four characters "Tian Xin Gets Rice". None of the civil and military ministers in the Manchu Dynasty could solve this mystery. The emperor had no choice but to publish a list to recruit talents. At this time, an official in the palace named He Tang said that he had a plan to retreat, and the emperor urgently announced that He Tang would go to the palace. He Tang pointed to the four words on the "War Table" and said to the emperor: "The sky is my country; the heart is the Central Plains; the rice is the sage. The heart of heaven takes rice, which means to seize the country and the king's kingdom." "The emperor asked anxiously: "What should we do?" He Tang said, "It doesn't matter, I have my own way of retreating." He took the pen in his hand and added one stroke to each of the four words, and returned the original letter. Someone came. The marshal leading the Xiongnu army thought that the Central Plains did not dare to fight, but when he took it apart, he was shocked and ordered his troops to retreat. It turns out that after He Tang added one stroke to each of the four characters "Tianxin takes rice", it became "I may not dare to come".

It should be possible!