Just Nonsense, If there is a confrontation between King Gwanggaeto and Alexander, Goguryeo's response is estimated to be this much.

 I can't believe that the two of them won't even meet. It may be difficult to prove it with the knowledge you have heard over your shoulders, but Goguryeo is very good at using cavalry with murals and literature records. And there is a word "Jumong" in Goguryeo. This word "Jumong" means a person who shoots arrows well. Is this a proper noun? I don't know if it is, but if it was used as a national nickname or a name, it sounds like archery or archery has already become popular in Goguryeo. (If you don't understand, you can't help but call the people of the eastern country of Gansiri Dongi-jok.) And it is said that Goguryeo youths learned writing, learned horse riding and archery from an early age, and trained themselves. Just as the Japanese had sublime ideas about knives (as they thought very sacred), Goguryeo people treated horses and bows very preciously, or cherished and worshipped them. Judging from this, Goguryeo's army can be said to be "a good bow, a powerful bow attack, and a well-established offensive tactical system using a bow." And what's important is that "the cavalry" is located at the end of the Silk Road. Of course, I didn't pass through there from the beginning, but I understand that even Ji Doo-woo was powerful during the reign of King Gwanggaeto. Of course, I don't even know if it was like that before King Gwanggaeto. Because of the lack of sunlight, Ji Doo-woo is a very good place for horse production, so many horses can be imported through this "Silk Road." The place where the Goguryeo people lived is a place where there were many horses (you will know if you think of the Yeojin people).Aren't they originally horse nomads? There is a lot of demand for horses and a lot of possession of horses. On top of that, what "the beacon" brought in from the West was much later than that of the East, that is, from the end of the 4th century to the 5th century when King Gwanggaeto lived, the cavalry system was not established. I don't say anything about the utility and effectiveness of "the beacon" and the benefits it brings. The army under Alexander is centered on infantry. Our great King Gwanggaeto's army is called Gaemusa Temple, a cavalry of at least 50,000 people wrapped in iron armor. Centering around these, archers who shoot well and infantry who will be in charge of the long-knife Baek Byeong-jeon are pouring in. Of course, the entire Goguryeo cavalry is not wearing iron gloves.^^; King Gwanggaeto's days were when he occupied Jiduwoo and at the same time, he hit the neighboring countries to make it a subordinate country. There are many nomadic peoples in the countries around Goguryeo. Then the tribute like the horse they offer is enormous. I want to say that I dare to catch at least 50,000 cavalry and have more than 100,000 cavalry. When Alexander's army and Gwanggaeto's army met. (I will explain mainly about Goguryeo.) First of all, cavalry armed with iron armor boldly rushed to the enemies. The cavalry of the "Koguryo," a nation of warriors with a strong commercial spirit, are right. Such cavalry retreated to the camp again after attacking the enemy camp. But what's noteworthy here is that those with ironclad bodies are extremely mobile. I don't know about tactics, but I've heard a lot from people around me. There should be something to fill the gap when the armored soldier retreated, but I don't know this -_-; anyway, after the armored soldier was removed, and again, the "Gimagungsa," armed with a long range and powerful firepower bow, poured tens of thousands of arrows into the camp. If you chase them, you will quickly fall into the water with quick mobility and try to fight against the white soldiers as an infantry. It'll be about this much. However, the number of Goguryeo troops is likely to be inferior to that of Alexander the Great. Therefore, our great King Ho Tae deals with the "paragrade", the core of the Goguryeo army, as an infantry while disturbing them through effective guerrilla and surprise attacks. This much is very so. The problem is climate adjustment... I just skipped things like this. If you think about this and that, you can't imagine this and that interesting things. These are simulations that cover all the knowledge we've picked up if we let it go lightly, just as we know that it's bad unconsciously, but we don't know much about Alexander the Great, that is, Greece. In conclusion, I can't write who wins. If you write down the Greek military's response or attack together, you will see a completed article. Unfortunately, I couldn't describe it in detail due to the lack of sunlight, but I tried to write it in my own way. If there is anything else to add or something wrong, please tackle it slightly. Be careful not to catch a cold in cold weather. ^^