By the time hundreds of Argentine militiamen on bicycles arrived at the scene of the incident, the Germans occupying the village had long since disappeared. The fields around the village were littered with white parachutes and strange cylindrical containers, but when the Argentines approached, they found that the only pieces of wood and rags were in the open containers.

In a small ditch far from the village, the Argentine patrol was lucky enough to find a complete container, which, like the ones previously found around the village, was about 1.5 meters long and 0.8 meters in diameter, black in color, and shaped like a giant cigar. After opening the container, the Argentines were surprised to find that it was full of grenades, counting hundreds of them, and the weight of the entire container was nearly 75 kilograms. After a simple calculation, the Argentines realized that the German unit had been replenished with abundant ammunition, and if they continued like this, they would never wait for the day when they ran out of ammunition and food.

After some time, the Argentine government finally assembled an infantry division of about 15,000 soldiers in Corvador, but with the help of German spies, Leto and Focquebel's troops engaged in a guerrilla war with the Argentine regular army, destroying railways and roads, plundering villages and harassing cities, but they refused to confront the Argentine army head-on. In the absence of cavalry and vehicles, the Argentine army in charge of encirclement and suppression found that the other side could easily shake off their tracking. The reconnaissance planes could have been able to help somewhat, but by the end of July, there were less than 10 reconnaissance planes left in the whole of Argentina, and the exchange of fire in the air in the border area was one of the reasons for the large loss of Argentine fighters, but the main thing was that the Germans had put in a new type of long-range fighters, which were not many in number, but the range was very amazing, and they always penetrated deep into the Argentine hinterland in a two-plane formation, and at the farthest they could even fly to a distance of five or six hundred kilometers from the border. And they are fast and firepowered, and Argentine planes often have to be shot down when they encounter them. Throughout the end of July, a total of 39 Argentine reconnaissance planes and fighter planes were shot down by such aircraft, and the Argentines had to hide the remaining planes as treasures.

For the Argentine government, at the beginning of August, several cities in their northwest were still occupied by the combined Chilean and German forces, and the old commander Aleandro's Army Group North, although still strong, could only rely on the defensive line to defend under the pressure of the coalition forces; in Peru. In the Battle of Lima, the Chilean army captured Lima, the capital of Peru, and completely annihilated the Peruvian Central Army, while the Brazilian and American coalition forces that came to reinforce were pinned down by the Chilean blocking forces in a place more than 40 kilometers northeast of Lima, and finally could only watch the capital of the allies fall.

At this time, the only good news that the Argentines received was the arrival of the American Volunteer Direen, the Air Wing. Because of the joint blockade of the Argentine coast by the Chilean and German navies, American pilots and planes had to be transported overland from Brazil to Argentina, and by the time the wing's more than 80 planes had assembled in the western suburbs of Buenos Aires, it was already mid-August. But anyway. Something is better than nothing, and after receiving reinforcements from the American Air Force, the Argentines have a lot of confidence. They began to actively plan a large-scale offensive on both the north and south fronts, and of course, the first task was to annihilate the hateful German forces.

On a sunny and sunny day, four P-1 fighters of the 1st Combat Reconnaissance Aircraft Squadron of the 3rd Air Wing of the American Volunteer Army swaggered over the Pampas. If it weren't for their silver livery and pentagram star insignia, it would have been easy for those familiar with the aircraft to see them as German Sky X-fighters. This is not surprising, since this fighter was manufactured by an American aircraft manufacturing company after purchasing a license for the production of the Sky X aircraft from the German Gigi Aviation, and was selected by the US Army in 1915 as a standard combat reconnaissance aircraft, and began to equip troops with troops that year and named the P-1 fighter (the historical American P-1 Eagle first flew in 1925, and the P-2 Hawk, which first flew in the same year, was an improved version of the P-1).

The Sky X fighter is a single-engine, biplane, and two-seat combat reconnaissance aircraft successfully developed by the German Gigi Aviation in 1912, with a 7.92 mm caliber machine gun directly mounted in the nose position. There are also two rotatable side-by-side machine guns in the co-pilot position, using a streamlined wooden fuselage like a hammer, this hard-shell structure of the fuselage has high strength, good survivability after being shot, easy to manufacture, suitable for mass production, and the engine uses a 150 hp in-line water-cooled engine, flying at a speed of 145 kilometers per hour, and the maximum time in the air is 150 minutes.

The squadron's commander, the pilot of the lead plane, George, was one of the first U.S. volunteers to arrive in South America, arriving in Brazil with his troops last month, but has been deployed in Brazil ever since. Occasionally, cross-border flights were only to Peru for reconnaissance, and there were several encounters with German fighters, but in view of the "German-U.S.-South American Non-Aggression Pact" signed by the two countries, the American volunteer pilots were told that they could only attack Chilean targets, and the German pilots received similar instructions, so the pilots of both sides could only politely wave their fists in the air.

Against this background, Ensign Wilhelmsson and his squad seemed to be somewhat idle, even when they came to Argentina and learned that there was a lot of German aircraft activity here, they still came out to patrol with a relaxed mood, and the order given to them by their superiors was to look for the German troops with secret traces, and to notify the Argentines as soon as they found them, but they were absolutely not allowed to attack them directly.

After taking off from the Del Valle airfield, west of Buenos Aires, Second Lieutenant Williamsson's flying squad had been flying westward, and according to information provided by the Argentines, that German unit had been regularly seen in recent times on the border between the provinces of Corvado and San Luis, as evidenced by the parachutes and ammunition containers left behind by the German Air Force's airdrops.

The Argentines had always been troubled by this strange tactical German team, and in the eyes of the American volunteers like Wilhelmson, they would not have left a force of more than 3,000 men in the enemy's hinterland to fight alone and maintain their supplies by airdrop. However, such a small German army made a mess of the Argentine hinterland, and after successive redeployments, more than 20,000 Argentine troops were withdrawn from the border area, which directly led to the cancellation of the Argentine high command from the plan of launching a large-scale offensive against Chile in July and August, and the Chileans were able to continue to send reinforcements to the 1st Army that entered the Peruvian operation.

As a matter of fact. Many generals and officers believed that if the Germans had not insisted on getting involved in the South American war, the Chileans would have lost the war long ago, and the Germans' strategy was obviously in violation of the Monroe Declaration put forward by the US Government in 1823, that is, "America is the America of the Americans," and the United States did not interfere in the internal affairs of Europe, nor would it allow Europeans to interfere in the affairs of the Americas. Therefore, these people thought that the Germans should be taught a good lesson. Let them understand that they are not soft persimmons to be easy to pinch.

Second Lieutenant Wilhelmsson himself was such a hard-line officer, but unfortunately the military orders from his superiors were like a mountain, and he had to suppress his anger and dissatisfaction in the bottom of his heart. In the vast Pampas, the flat terrain makes the landscape within a radius of tens of miles unobstructed in front of the pilots' eyes, but it is not so easy to find a group of people from the air who are interested in hiding. The woods, villages, and hills along the river could have become hiding places for the Germans. Therefore, Wilhelmsson asked everyone to lower the altitude to about 200 meters and disperse the search.

The short hour passed quickly, but the American flying team did not cut anything, and the German unit did not know whether it had moved or hid somewhere that was not easy to detect, in short, the troops of more than 3,000 people did not stand stupidly on the steppe waiting to be discovered.

1 hour is the usual one-way flight time for the P-1 combat reconnaissance aircraft. Because half of the fuel has been consumed. Second Lieutenant Wilhelmsson had no choice but to beckon his men to prepare for the return voyage. However, the heavens seemed to be deliberately playing tricks on these pilots who had come from North America to South America, and before they could turn around and fly back, they noticed two blue-gray dots flying rapidly to the northwest. Maybe the other side was too fast, or maybe the color was close to the background of the sky, and the two sides were only 6 or 7 kilometers away when the Americans spotted them.

"Battle formation!" Ensign Wilhelmsson shouted and made a gesture to form a battle formation, and in a short time, the four fighters regrouped together and lined up in a herringbone formation with Wilsonson's fighter as the arrow, with the No. 2 wingman in the middle of the squad behind Wilhelmsson, and No. 3 and No. 4 aircraft in the right rear.

When the Americans formed in the air, the two planes continued to fly in this direction, as if they intended to say hello to these American fighters. The high speed of the relative flight allows both sides to quickly see each other's general outlines with the naked eye. Wilhelmsson found that they were two never-before-seen aircraft, with an extremely simple appearance, monoplanes but different from the upper monoplane arrangement of the Hummingbird. For the Americans, especially the Americans, the Germans' new gadgets are always both surprising and worried, aircraft carriers, submarines, tanks and airborne troops, these tactics seem to them to be a bit sideways, but they can always achieve one unconventional victory after another.

"No. 2, you follow me and keep an eye on the one in front of you, No. 3 and No. 4. You are in charge of the one in the back, and you are only allowed to pursue and not fire! Wilhelmsson decisively instructed his squad to let the Germans know that they were not left to do whatever they wanted, and that there was still the great American Air Force here. As for the performance of this P-1 combat reconnaissance aircraft, although Wilhelmsson did not have great expectations, he felt that in a 4-to-2 situation, his side should still have a great advantage.

When the two blue-gray fighters passed less than 20 meters away from him, Williamson suddenly had a very bad feeling in his heart. The white iron crosses on the fuselages of the two planes did not surprise him, but the almost closed bubble-shaped cockpit, streamlined fuselage and pointed wings seemed to greatly reduce air resistance, and their galloping posture did show their extraordinary speed, coupled with the unusual black spray spots on the silver-gray fuselage, Wilhelmsson thought that he might really meet a tough opponent.

Of course, speed is not the only measure of a fighter's performance, maneuverability, firepower and defense are equally important, and the Germans know it, and the Americans understand it. For this reason, Wilhelmsson and his team did not give up on a simulated contest with the Germans, and after a sharp turn, they followed at a maximum speed of 145 km/h.

Under the restrictions of the "German-U.S. Non-Aggression Pact on the South American Battlefield," they could not do anything to the four planes painted with the US military logo, but seeing that the US planes were following closely, the two experienced German pilots also guessed each other's intentions. After gesturing, the two German fighters suddenly swung their wings in a large arc, one to the left and the other to the south.

Seeing this, Wilhelmsson and his pilots secretly laughed in their hearts, the two German planes were already at a numerical disadvantage, but now they actually chose to break up the two-plane formation to fly, so the four US planes chased after their target in pairs according to the plan. But the chase has just begun, and the confidence and fighting spirit of the American pilots are decreasing little by little, because the speed of the other side is too fast!

Seeing that the distance between himself and the other side was getting farther and farther, Wilhelmsson and his wingmen had no choice but to adopt the tactic of flanking and outflanking the other side in order to intercept the other side when they turned, and the American pilots who pursued the other German plane soon adopted the same tactic.

After flying nearly 10 kilometers in a straight line, the two German planes turned one after another, but instead of falling into the Americans' two-plane interception tactics, they each bit one of the American fighters through a continuous change of direction, and under the obvious speed advantage, they gradually narrowed the distance with the other side.

Turning, climbing, diving, tumbling, Wilhelmson's fighter made a series of dazzling maneuvers, but when he looked back, the German fighter was still closely following, and his own wingman was far behind. Just as he turned again and was about to join the wingman, a roar of the engine approached a very close distance, and the German plane actually flew more than ten meters behind him.

In just half an hour, four American fighters and two German fighters competed fiercely in the air, which was not only a battle of wits between pilots, but also a performance competition between fighters. After a few rounds, the Americans had to admit that they were completely inferior to the Germans. In the end, Wilhelmsson and his team had to use fuel constraints as a fig leaf to return to the base, and the two German planes followed closely behind until they approached the US airfield.

Later, Wilhelmsson wrote in his report: "The two German fighters we encountered had a very advanced design, a speed of at least 200 kilometers per hour, first-class maneuverability, and a very long range, but so far their firepower and defense are unknown.

Unbeknownst to Wilhelmson, the two German fighters had each dropped a sleek and streamlined fuel tank before approaching them, and as for firepower, six 7.92 mm machine guns were enough to tear a wooden-skinned aircraft to shreds in an instant, and in terms of defense, with the cooperation of Dr. Junkers and Dr. Heinkel, this Junkers-Heinkel D became the second all-metal military aircraft after the Vulture D, and the first wide, all-metal, conventional layout of the lower wing fighter.