In the thousands of years of military history in ancient China, it can be said that the first truly powerful army was the Qin Army during the Warring States Period. The reason why it is said to be powerful is that it single-handedly wiped out nearly 2 million troops from six countries, and defeated the Xiongnu and Baiyue without the ability to fight back. It can be said that it has no opponents in the east. Moreover, under the leadership of Qin Shihuang, he swept away Liuhe, unified the world, conquered all directions, and opened up territories. He was very powerful. During this period, a very powerful empire and army also emerged in the Western world. This was the first empire in European history, the Alexander Empire. With its powerful Macedonian cavalry phalanx, it conquered east and west in Europe and was invincible. , established a huge empire spanning Europe, Asia and Africa. And under the leadership of Alexander, an outstanding commander, he won every battle and became an undefeated army. The Qin Empire and the Alexander Empire were each the first unified empires in Chinese and European history. Qin Shihuang was so majestic that he annexed six countries and dominated the Yellow River and Yangtze River basins; Alexander of Macedonia, although he only lived 33 years old, established a world empire that spanned Europe, Asia, and Africa, and was known as "the first among famous Western generals" people".

The purpose of Alexander's expedition was to conquer the world. He has a famous saying: "A person with lofty ideals should not draw a line in his struggle." His eastern expedition was based on his father Philip II. First of all, the Macedonian phalanx established by Philip II was the most powerful army in Europe; secondly, Macedonia had many brave cavalry; finally, Alexander's military Talent was also the reason for his success in the Eastern Expedition. His tactical characteristics were: choosing the right target and attacking with all his strength; attacking in the east and in the west, and winning by surprise.

Let’s look at the advantages of the Qin army: First, it has elite soldiers and armor. The Qin army is said to have millions of infantry, thousands of chariots, and ten thousand horses, so weapons are particularly important. At that time, the bronze swords of the Qin people were made of alloy and mechanically filed. This was a standard modern product. Secondly, the Qin people invented the bronze crossbow machine for immediate combat, which had a long range and great damage. Finally, the Qin state's heavy crossbow, It has superior combat power and a range of more than 900 meters.

In terms of running the army, judging from the layout of the Terracotta Warriors and Horses, the crossbowmen are at the front (the only arrows in the world of the Qin Army are bullets), shooting in turns, producing a dense rain of arrows, and shooting a large number of arrows from a long distance. Kill the enemy; the main part is infantry and chariot soldiers, armed with spears and other long-handled weapons; at the same time, the infantry is equipped with short swords, which is conducive to physical combat; the cavalry troops on both sides use bronze crossbows as weapons.

If Alexander continues his eastern expedition, we might as well refer to what happened to the Huns. The German sinologist Schade wrote in "Records of the Great Qin": 100,000 Huns cavalry were surrounded by weapons called crossbows in one day. Arrows flew from the sky like locusts. They had not yet reached the Qin Dynasty. In front of the military formation, 80,000 people were massacred. Just as the Huns were still in shock, the bronze phalanx of the Qin army pressed over like a castle. What was even more terrifying was that they still had heads hanging on their waists. From this we can see how powerful the Qin army's heavy infantry, combined with strong bows and crossbows, instantly wiped out 80,000 powerful Xiongnu cavalry. Even if Alexander's Macedonian cavalry is as powerful as the powerful Huns, they will be vulnerable to the Qin army after traveling a long way, and the victory or defeat will be clear at a glance.