Recently, an emergency drill in a complex field environment was launched in a certain department. In the face of the "enemy situation" report that followed, the officers and soldiers participating in the training, according to the pre-prepared plan, seized the aircraft, cooperated closely, responded effectively to the special situation, and successfully completed the training task. This reminds us that only when we practice our fighting skills and strengthen our ability to overcome danger can we overcome "unexpected" without fear of "uninvited guests". Clausewitz said, "No human activity can leave such a vast world for the unexpected visitor like war". War is an activity full of probabilities, probabilities and dangers, and it is basically impossible to win. Especially in the information-based and intelligent war, the situation is complex and rapidly changing, and the uncertain factors increase sharply. This kind of contingency, some of which are equipment reasons, some of which are war methods reasons, and some of which are human reasons, often comes unexpectedly at the weakest part and the most critical time of the war, and often affects the trend of the war, determines the victory or defeat of the war, and becomes "the last straw that overwhelms the camel". The battlefield is the fairest arena, and the war is the severest auditor. In modern China, the painful lessons and humiliating memories of backwardness and beatings caused by inadequate hardship and preparation are still fresh in our memory. History profoundly shows that only by keeping a close eye on the powerful enemy, adhering to the bottom line thinking, focusing on the most severe situation, and forging stronger capabilities and more reliable means, can we better play our strategic functions of shaping the situation, managing the crisis, containing the war, and winning the war, and resolutely defend national sovereignty, security, and development interests. "War is the kingdom of uncertainty." When it comes to the real battlefield, it is impossible for any army to have a smooth flow at all times, and difficulties such as command interruption, attack frustration, and insufficient supplies may occur. As Comrade Deng Xiaoping said, "We should base our work on the occurrence of major risks and prepare countermeasures. In this way, even if there are major risks, the sky will not fall". We should strengthen the sense of hardship, consciously "put our work on the worst basis to imagine", fully think about difficulties and challenges, make the response plan more solid, prefer to be prepared and strong, unprepared and insufficient, and really improve the targeted effectiveness of military struggle preparation, so that we can be prepared and unprepared. The ancient Roman military strategist Weg Tius said: "Whoever wants to gain a favorable result should rely on art and knowledge to carry out the war, not on chance." Victory has always preferred the hard-wired army and the hard-wired soldiers. As revolutionary soldiers in the new era, we should anchor the centenary goal of building the army, focus all our energy on fighting, work hard on fighting, focus on the changes of technology, war and opponents, and promote the training and preparation without delay. Only when we have fully trained what we lack, what we need in the battlefield, and what our opponents are afraid of, can we firmly grasp the initiative of the future battlefield and seize the opportunity to win. (Outlook New Era)