In the works of this period left by Yu Dafu, it is particularly valuable that he recorded his calm thinking after some fanaticism. -This is a complicated feeling called "1February 28th". He first recalled his earlier naivety: "During the war, while witnessing and hearing the smoke and gunfire of Zhabei fire, we only ran the road, wrote articles and chatted. If you get a little news of victory, report it everywhere and encourage it. When they get some bad news, they will get together to drink, scold and sometimes cry. " Yu Dafu didn't hide his weaknesses and shortcomings, but revealed the fanaticism and impetuousness that were common among scholars at that time. However, since "one? After the "February 28th" War, because the nation suffered a life-and-death test, he began to reflect calmly and seriously on the whole war, including "economic war, propaganda war, diplomatic war" and so on. At this time, Yu Dafu seriously put forward such a view: "The lesson we have learned is that the Chinese nation will never have room for survival, no matter which faction, department or person in the opposition, if we don't unite with sincerity and courage, we will work together with one heart and one mind and sacrifice together. "When the central government is too weak and autocratic, the enemy will immediately take the opportunity to enter and implement its poisonous plan of nibbling, provoking and alienating, and detecting our weaknesses, so as to take advantage of it. This is the usual trick of the enemy. "

Yu Dafu is neither a politician nor a strategist. However, he expounded his views on war with the sensitivity of literati and the sense of smell of writers, especially on the "central government", which was really commendable and far-sighted. It is said that there was a story circulating in the military circles at that time: Yu Hanmou, the military and political leader of Guangdong Province, was very surprised when he heard that Yu Dafu had written a current affairs paper entitled "Military and Politics" and sought to buy it at a high price of six yuan.