When Germany's declaration of war note was delivered to the U.S. government, it was July 7 at 12 noon EST.

After returning to the German Embassy in Washington, D.C., the German ambassador Wernapurier sent the last clear-code telegram from this embassy to Berlin: The mission has been accomplished, the war has officially begun, long live the Reich!

After this, Werner hurriedly left with the embassy staff, and the German diplomats in the United States were to leave the United States in three days on neutral ships, and the American diplomats and envoys in Germany were also to leave Germany within a limited time.

Half an hour after the United States received a note declaring war from the German government, the Mexican government also declared war on the United States, for the simple reason that the Mexicans wanted to recover the land they had lost more than 70 years ago.

Although there was little psychological preparation for the German government's declaration of war, US President Warren, Harding and his staff quickly recovered from the shock: the Germans had declared war, the situation was irretrievable after all, and in Guadeloupe, less than 2,000 nautical miles from New York on the east coast, the main fleet of the German Navy had already assembled and stood by - why did the huge convoy stay there for more than a month, for the sake of this moment! In Mexico, which is adjacent to them to the south, 400,000 German troops and 700,000 Mexican troops have been assembled on the border, and they are not here to engage in any bullshit exercises at all - it is clearly an organized and premeditated offensive preparation!

Is there anything worse than that?

Warren Harding suddenly remembered Secretary of State Charles Hughes, who was still holding secret talks with high-level Japanese officials in Tokyo, and remembered the Japanese government, which had always been on the verge of making a move, and before today, he had always felt that using the Philippines and Hawaii as bargaining chips to exchange peace for the Japanese would only make that greedy nation grow in appetite, but now, when the situation of a two-front battle was about to be placed in front of him, Warren Harding felt so frightened for the first time in his life.

"Send a telegram to the Secretary of State asking him to prevent the Japanese from joining the side of the Germans no matter what! Do whatever it takes! ”

At this time, thinking about the situation in the Pacific, I have to say that Warren Harding's overall view of the situation is not bad. But by the time he summoned the army and navy generals to the White House to discuss how to deal with a possible German attack, it was already an hour after Germany had handed over its war note. Before that, the radio waves had already spread from Berlin to Guadeloupe and Mexico, and the long-planned "Titan Project" had officially begun!

Towards 1 p.m., at the military airfields of Simenez, Madeira, Keno, Paredon and Linareti in Mexico, a series of metal warhawks took off one after another, most of them German fighters painted in silver gray, but also some Mexican fighters painted in dark green. In the somewhat dazzling blazing sun. Hundreds of fighter jets, attack planes and bombers took off from these airfields in three waves toward the U.S. border.

In the first wave were six fighter squadrons of the 4th Fighter Wing of the Luftwaffe, four attack aircraft squadrons of the 11th Attack Aircraft Wing and two fighter squadrons of the Mexican Air Force. After taking off from their respective airfields, 96 Junkers-Heinkel D-type fighters, 54 Messersch-4 fighters, 25 Vulture D-type attack aircraft, 75 Vulture DD attack planes, and 50 Mexican fighters completed their formation in the air, and then flew to their respective targets according to the predetermined plan -- at present, the US Army mainly has three large military airfields, 11 small and medium-sized military airfields, and five airship bases on the southern border side. These 14 military airfields, 100 to 300 kilometers from the border, are home to 280 to 320 aircraft and 75 to 80 airships, which are also the front-line air forces deployed by the United States on the southern border.

Half an hour apart from the first group, the second wave of attack groups consisted of three squadrons of German fighters, two squadrons of German attack aircraft, and four squadrons of German bombers. The main fighter flew in June 1919. Mass production began in September of the same year, and during the South American War, two fighter squadrons equipped with this fighter went to Chile to participate in the war, and successfully assisted the Chilean coalition forces to seize air supremacy on the battlefield. Name implies. This fighter is jointly designed by the famous military aircraft designers Dr. Junkers and Dr. Heinkel, with a wingspan of 12.4 meters, a length of 9.3 meters, a height of 4 meters, a maximum take-off weight of 2.6 tons, equipped with a 700 horsepower water-cooled engine, a maximum speed of 420 kilometers per hour, can be attached to the auxiliary fuel tank, a maximum range of 800 kilometers, and is equipped with six 7.92 mm machine guns. It has armor protection and a fully enclosed bubble cockpit, and its performance is basically at the level of the main fighters in the early 30s in another world, and it is slightly inferior to the famous Hurricane fighters.

Of the 15 fighter squadrons deployed in Mexico, the Messerschmitt D type fighters accounted for 1/4, which was a new main fighter, which flew in July 1923 and began mass production in December, and is currently mainly equipped with the Luftwaffe and army air units. By the time of the outbreak of the German-American war, a total of 278 aircraft were equipped. Surprisingly, the designer of this fighter was actually an unknown young man - Willie Messerschmidt, a young man born in Frankfurt, Germany in 1898, who was a glider enthusiast since childhood, and at the age of 15 he was still in secondary school made an all-metal glider (historical fact), showing his talent in aircraft design. After graduating from secondary school, Messerschmidt enrolled in the Department of Mechanical Engineering at the Technical University of Munich, where he was fascinated by aircraft design even during his intense studies, which he used to defend his thesis. After graduating from university, Messerschmitt was going to start his own aircraft factory, but at this time, Dr. Junkers, the head of military aircraft design at Gigi Aviation, came to the door in person, and Junkers was already a household name in Germany at this time.

Soon after, the Messerschmitt D was introduced, and although this new fighter drew on much of the experience of the Junkers-Heinkel IV, it became a workhorse that was very different from the Junkers-Heinkel D, thanks to the ingenuity of Messerschmitt himself. The Messerschmitt D fighter adopts a cantilever lower wing design and retractable landing gear, and adopts more straight line modification in appearance, and it uses high-strength thin aluminum plate and precision die-casting version in the structure, and the reinforced fuselage can withstand high-speed dives and rapid lateral rolling, with a wingspan of 10.5 meters and a length of 9.4 meters. The height of the aircraft is 2.8 meters, the maximum take-off weight is 3.1 tons, and it uses a 750-horsepower in-line water-cooled engine, with a maximum speed of 450 kilometers per hour, and a maximum range of 850 kilometers. Armed with a 20 mm cannon and four 7.92 mm machine guns, it is identical in firepower to the Henkel DD carrier-based fighter, but in terms of combat performance is a notch higher. This has already been demonstrated in joint exercises between the German Army and Navy, for which the Admiralty has asked Messerschmidt to design a carrier-based fighter with similar performance to the land-based Messerschmitt IV specifically for the Navy.

In the Luftwaffe, in addition to the above two main fighters, there is also a single-wing twin-engine large long-range fighter called the Black Hawk DD type in active service, which was designed by two Dutch designers of Gigi Aviation - Dr. Billing and Dr. Schatters, and was tested in October 1921 and began mass production the following year, with a wingspan of 15.7 meters, a length of 12.8 meters, and a height of 4.2 meters. It uses two 800 hp Mercedes engines. It has a top speed of 390 kilometers per hour, a range of 1,150 kilometers with auxiliary fuel tanks, and two 20 mm guns and four 7.92 mm machine guns as on-board weapons. Maximum take-off weight 5.4 tons.

According to the intelligence collected by German spies, the best fighter in the United States is the PW-9 fighter produced by Boeing and the P-7 fighter of Kodis, of which Boeing PW-9 has two models with very different appearances, namely PW-9A and PW-9B, Type A is a biplane, using bolted aluminum tubes to form a fuselage structure, the fuselage is small and compact, using a 450-horsepower air-cooled engine, the maximum speed is 310 kilometers per hour, and the fuselage can be hung on a 200-kilogram aerial bomb; The Type B features a shoulder-mounted monoplane and aluminum monocoque fuselage with a 500 hp air-cooled engine. The top speed was 25 kilometers per hour faster than that of the A-type, but the bomb pylons under the fuselage were eliminated due to limited lift. Both fighters have a range of 480 kilometers and are equipped not only with the U.S. Army, but also with the Admiralty, and their Navy models are designated F4A and F4B, with a ship's arresting hook in the tail.

Compared with the Boeing fighter, the Cordis ground fighter borrowed more from the design of the German fighter, and since the appearance of the Junkers-Heinkel 4 in South America, the designers of the Cordis company began to study this peculiar shape according to the description of the pilots. In the years following the war, they learned more about the German fighter through fragmentary information collected by army intelligence, and in 1923 introduced the first cantilever lower monoplane in the United States, which used an all-aluminum monocoque fuselage and retractable landing gear. The length of the aircraft is 12.3 meters, the wingspan is 17.7 meters, but due to the lack of power of the 600-horsepower star-shaped engine it is equipped with, its speed is only 280 kilometers per hour, although its 12.7 mm machine gun and 1 7.62 mm firepower are stronger than the two 7.62 mm machine guns of the two Boeing fighters, but the United States seems to have some scruples about its novel design, too slow speed and expensive price, so the army and navy only ordered 25 and 21 respectively, Far less than the 120 and 150 fighters of the Boeing model.

In addition, the US Army and Navy are each equipped with hundreds of fighters developed and produced earlier, such as the P-3, P-4, and P-5, and the US generals firmly believe that their airships will undoubtedly seize absolute air supremacy in the defense of the homeland. By 1924, the American airship technology was unmatched in the world, and even the Germans, who were the first to use airships on a large scale in the war, had to bow to the wind. Despite this, 35 German airships came to Mexico from as far away as Europe, and they were also regarded by the United States as the number one rival in the air.

However, there was no trace of airships even in the third wave of the German air attack group, and two fighter squadrons, one attack aircraft squadron, and six bomber squadrons would carry out low-altitude bombing of US airfields, oil depots, barracks, railway junctions, and other military targets after the first two wave of attack groups suppressed US air and ground resistance, so as to achieve the operational purpose of quickly seizing air supremacy on the front line.

Just as the group of planes taking off from the front-line airfield was preparing to attack their targets, at the airport in San Luis Poto, one after another large bombers were also taking off, this single-wing four-engine Dornier DD long-range bomber was designed by the bomber design department of Gigiere Aviation in 1922, the prototype began to fly in April of the following year, and began mass production in November, with the current production of 50 aircraft per month, with the implementation of the Titan program, this speed will also be increased by at least ten times.

When the attack aircraft group departing from the front-line airfield began to attack, five squadrons of 125 Dornier DD long-range bombers with a wingspan of 32.2 meters, a length of 21.6 meters, and a total of 32.2 meters were assembled over San Luis Poto. The 5.2-meter-tall behemoth is slightly smaller than the German Owl bomber and the Russian Ilya Muromets bomber in the wood-skinned era, but its performance has greatly surpassed that of the ancient biplane, especially the thin armor and 12 7.92mm machine guns arranged in the turrets of 6 twin engines, which make this aircraft much more defensive than any bomber of its time, plus 4 800 horsepower high-power engines, the Dornier DD can cruise at 280 kilometers, and at a speed of 4 tons of bombs can be dropped on targets 3200 kilometers away, and the maximum speed can even reach 320 kilometers per hour.

At this time, the Americans obviously did not have any interest in this long-range strategic bomber, perhaps in the eyes of these self-righteous guys, the giant airship is far stronger than the so-called strategic bomber in terms of range, bomb load and deterrent, and perhaps even Count Zeppelin, the ancestor of military airships, did not expect that the Americans would be more devout than the Germans in their own inventions.

It won't be long before the Americans will be annoyed to find out how great the mistake they have made is - a Dornier DD bomber costs only 1/3 of a large hydrogen airship and 1/20 of a helium airship, but it can bomb targets more than 4 times in the time it takes for an airship to bomb once, and it is far less affected by the climate than an airship.

Shortly after the take-off of the Dornier DD bombers, two squadrons of Junkers-Heinkel D fighters and a squadron of Black Hawk DD heavy fighters also took off from San Luis Poto Airport to escort the bomber group over the border area, after which the bomber group will fly at an altitude of 5,000 meters to the heavy industrial area of the northeastern United States.

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