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On February 20, the squadron was still at Tierra Corollada, and had not yet captured the American Army's No. 1 Heights. However, the commanders on the front, both in China and in Mexico, were not in a hurry. Although they did not break through the American defenses, they inflicted heavy casualties on the American troops, and as the American forces were killed and wounded in large numbers, it was only a matter of time before the squadron captured the Tira Cororada, and finally broke through the defense line of the Sierra Madre do Sur, which the Americans had painstakingly constructed.

On the morning of the 20th, from 8 o'clock, the artillery of the Chinese army began a fierce artillery bombardment of the No. 1 high ground of the US army, hundreds of heavy artillery guns opened fire together, the orange-red fire shone in the muzzle, and one after another shells roared and smashed into the No. 1 high ground of the US army. In the midst of the dense explosions, the entire No. 1 Heights were enveloped in gunsmoke.

At this time, after days of artillery bombardment and bombardment by the squadron, the anti-artillery holes, tunnels, and other fortifications built by the US troops had been completely destroyed. The heights were covered with a thick layer of dust, which was formed by the rocks being shattered by the shelling of Chinese artillery and the bombardment of airship units of the Air Force. After the anti-artillery holes and tunnels were destroyed, every time the Chinese artillery shelled and airships bombarded, the American officers and soldiers guarding the high ground could only huddle in the trenches, praying that the shells and bombs would not fall on their heads, otherwise there would be only a dead end. Under such circumstances, the U.S. military paid a heavy price in order to hold the No. 1 heights. In the past 10 days of fierce fighting, one division has been crippled every day, and in the past few days, the US army has rotated three corps on Heights 1. The total number of casualties has already exceeded 100,000. Such heavy casualties made the commander of the US army, Lieutenant General Clark, and the top commander of the US forces in Mexico, Admiral Pershing, very angry. However, on the battlefield, the squadron completely occupied an absolute advantage, and the US army had to fight with the squadron and the Japanese mercenaries.

In the face of the shelling of Chinese artillery, the artillery of the American army also launched a counterattack. However, the US artillery suffered a lot of losses in the continuous battles, and the Chinese Air Force's airships often bombed the US artillery positions, so that the US artillery losses were far greater than the Chinese artillery. But now, the number of artillery in the US army is only half of what it was at the beginning of the battle. The rest of the artillery was either destroyed in an artillery battle or blown up by the airships of the Chinese Air Force. So much so that in the contest between the artillery of the two sides, the Chinese artillery has already occupied a decisive advantage.

At the time of the Chinese artillery shelling the No. 1 high ground of the American army, the officers and men of the 19th Division of the Japanese mercenary army had already entered the attack position. After the shelling is over, they will launch an attack on the No. 1 high ground of the US army, which has become a fixed pattern for several days. The U.S. military had to bear the fire of the Chinese artillery first, and then it had to rely on the broken fortifications and the murderous Japanese mercenaries to fight, and once the Chinese airship arrived, it had to bear the bombardment of the aerial bombs dropped by the airship, which was the main reason why the U.S. military suffered such heavy losses.

On a high ground far from the battlefield. Chinese Minister of War and Field Marshal Zhao Bozheng, Commander of the 2nd Army, General Xie Dingkun, and Commander of the 7th Army, General Du Qizheng, watched the Japanese mercenary attack. These days, apart from the use of artillery, the infantry of the squadron has not been involved in the attack on the Iron La Corolada. and the U.S. military to fight for consumption. It's always been just a Japanese mercenary. Even though the Japanese mercenaries were poorly equipped, with the support of Chinese artillery and air force, they were still on a par with the US military. Even the Japanese mercenaries, relying on their tenacious and ferocious will to fight, have always pressed the US military. It cost the U.S. military even more casualties.

"Marshal, I finally understand why His Majesty has been on guard against Xiao Ri. I have to say that these Xiao Ri are really the best candidates for mercenaries, they are not only ruthless to the enemy, but even more ruthless to themselves. Once the empire weakens, these small days will become a big problem for the empire! Admiral Xie Dingkun said. His 2nd Army has been guarding Japan for many years, and he is relatively clear about the mentality of these Japanese people.

"Of course, when it was still the first year of the First Wu Dynasty, the decaying Manchu Qing was almost defeated by Xiao Ri, if it weren't for the fact that His Majesty took advantage of the situation in western Sichuan, destroyed the Manchu Qing Dynasty, and defeated Xiao Ri, where would there be a powerful empire now. I'm afraid that the common people of the empire have long been enslaved by Xiao Ri and the Western powers! Marshal Zhao Bo said.

"As long as the empire is always strong, Xiao Ri will always be a dog we raise. These days, the mercenaries have also lost sixty or seventy thousand people, but the guy Yoshimasa Oshima has been pretending to be a grandson. Admiral Du Qizheng also said.

"The empire will never decline, and it is the duty of our people to sweep away the enemies of the empire and build a powerful empire for all eternity under the leadership of His Majesty!" Marshal Zhao Bo said firmly.

Admiral Xie Dingkun and Admiral Du Qizheng both nodded, this is exactly what they have been fighting for all their lives.

After half an hour of shelling, the 19th Division of the Japanese mercenaries launched an attack, and after withstanding the heavy shelling, the US troops suffered heavy losses. It was the US reinforcements who arrived in time, otherwise, Heights 1 might have changed hands. It's just that the squadron doesn't seem to have any intention of taking the No. 1 high ground in one go, otherwise, as long as the Chinese elite army is sent to battle, and then the Japanese mercenaries cooperate to seize the No. 1 high ground of the American army, it will not be a big problem.

The commander of the U.S. Army, Lieutenant General Clark, stayed on Heights 3 south of Tierra Cororada, staring at Yiqiē with a raging anger in his eyes. The loss of the past few days has completely made his heart drip blood all the time!

"Did our airship unit set off? Calculate the time, the Chinese airship troops should be coming soon! Lieutenant General Clark asked.

"General, the Chinese airship unit will arrive at the battlefield in about twenty minutes, and our airship unit has also set off. However, it may not be possible to arrive in half an hour. The performance of our airship is a little worse than that of the Chinese! But we have a larger number of airships, and after the arrival of the first batch of fifty airships, the next hundred will arrive two days later. At that time, we will be able to shoot down all the Chinese airships, and even let the Chinese taste the taste of being bombed! Said Lieutenant General Clark's aide-de-camp.

When Lieutenant General Clark heard this, a smile finally appeared on his face. He was very much looking forward to seeing the performance of the US airship unit, and hoped that the US airship unit would be able to defeat the Chinese airship and be ashamed.

At 9:15 a.m., the airships of the airship unit of the Chinese Air Force arrived in Tierra Coroda and began bombing the American fortifications. It's just that the current bombing is not only limited to the No. 1 heights, the other two highlands have been the target of the airship force bombing in the urban area of Tiela Corollada, and every bombing can make the US military pay a heavy price. Every bombing has made the US military miserable.

In the sky, there are 56 airships left, including 19 heavy airships and 37 medium airships. The other four airships, during their previous bombing missions, malfunctioned and had to withdraw from the bombing. Fortunately, none of these malfunctioning airships were shot down by the US military, and they all landed safely without casualties.

When the airship unit of the Chinese Air Force appeared in the sky above the Tiela Corollada, dozens of dense light and heavy machine gun bullets began to shoot at the sky. The formation of the airship units of the Chinese Air Force in the sky was slightly confused, but then calmed down.

War is undoubtedly the best catalyst for the development of science and technology, and after being bombed by the airship units of the Chinese Air Force, some officers in the US military converted the existing light machine guns and heavy machine guns into heavy machine guns capable of firing at the air. However, this is not a special heavy machine gun after all, and the maximum anti-aircraft firing range is only 800 meters, and the effective firing range is less than 600 meters, so there is no threat to the Chinese airship unit that is bombing at an altitude of more than 1,000 meters. However, the U.S. military doesn't seem to know about this situation, and they are still firing, as if this can make them feel more at ease!

A few minutes later, the airship units of the Chinese Air Force began bombing the positions of the American troops. 250 kg of aerial bombs and 500 kg of aerial bombs were constantly dropped from the airship. Clusters of orange-red fireballs rose from above the U.S. positions, inflicting heavy casualties on the U.S. troops. For the sake of safety, the Chinese Air Force almost always keeps bombs dropped at an altitude of more than 1,000 meters, which makes the accuracy of hitting a lot lower. However, even this has caused great casualties to the US military. After all, hundreds of thousands of U.S. troops are crammed into the three highlands and the small town of the lieutenant general, and as long as they drop bombs in this area, no matter what, they will not return empty-handed.

At 9:30 a.m., a group of black dots appeared in the eastern sky, and slowly, these black dots got closer and closer, and finally evolved into a series of white-painted airships, on which the Star-Spangled Banner was very conspicuous in the sunlight.

The airship units of the Chinese Air Force, which were bombing the Tiela Corollada, discovered the situation, and the original dense formation left and dispersed, like a flock of birds suddenly dispersed in the air.

"Attention all airships, the American airships appeared, immediately dropped all the bombs and prepared for air combat!" Major General Chen Qifeng, commander of the airship unit of the Chinese Air Force, gave the order to prepare for air combat!