Everything at the strategic level is always linked to the whole, the sudden discovery of the Yanchang, Yulin, Changqing Oilfield immediately attracted the strong attention of the Japanese invaders, as more and more There are many oil wells being dug out, everyone is sure that there is really a big oil field here! The Japanese invaders immediately began to change their strategy, abandoning the fierce pursuit of the Chinese army on the frontal battlefield, ending the Battle of Guiluu as soon as possible, and mobilizing armored vehicles. equipment and troops, and prepared to launch a large-scale attack against the northwest region to capture these three lands in one fell swoop. Their interest in oil was so strong that the raging Huaihe River War fell on deaf ears, and Japanese troops in the Lianghuai area requested help from the Chinese military headquarters. The 13. Corps of the Huaihe River, implying that it intentionally abandoned the Huaihe River and the Huaihe area, and concentrated more troops to prepare for the war for oil and gas resources in the Northwest. ,The German army was not idle either, their engineering units urgently constructed a straight asphalt road more than 1,000 meters long, reinforced it and turned it into a runway, making people even want to let heavy bombers fly. Taking off was also very awkward. No need to be so troublesome, what the hell is the marshal doing? Marshal Kesselring did not explain but continuously promoted the project's progress, providing free high-quality special concrete, and using a large amount of metal, looking for ways to make the runway more solid. At the same time, 48 DO-217 heavy bombers transferred from China also began training. The training content was to fly low at night to avoid enemy radar and quietly approach the target. This is very dangerous, at night it is pitch black, objects cannot be seen, even flying at high altitudes is not safe, let alone flying at extremely low altitudes. After all, the marshal is a member of the air force, he knows how dangerous it is, so he doesn't know where to get a set of bombardment radars to modify bombers, bombers with bombardment radars. can roughly see the ground situation when flying at night. , With this artifact, these German pilots who have gone through many battles are equivalent to having a pair of telescopic eyes, and the risk of flying low at night is greatly reduced.