The solution that Sima Yi came up with was to use explosives to destroy the Roman trenches and city defenses, and use better artillery to break through.

After all, the Han army was equipped with firearms much earlier than the Romans, and the research and use of firearms were far ahead of the Romans.

This time, reinforcements soon arrived, the Han army sent five more divisions, and the Persians also added 50,000 reinforcements, and the strength advantage of the Han army became increasingly obvious.

The casualty ratio between the two sides was not much different, and the Han army was ruthless, attacking the city day and night, and the Romans soon could not parry.

The high ground outside the city was conquered one after another, and the Han army could mount artillery on the high ground and carry out artillery bombardment of the city day and night.

Except for the lighthouse and library, which Lu Kang repeatedly explained that needed to be preserved intact, other urban areas and ports were subjected to saturated shelling.

Every day, a large number of Egyptians surrendered to the Han army, and the Han army also deliberately released all the civilians in the city, even if you were dressed as a soldier, as long as you laid down your arms, you were released from the city.

After two months of siege, the morale and morale of the Romans were declining, Musius did not have the powerful means and organizational skills of Marcus, and the Roman Empire did not send so many naval ships.

In January 215, the second day of the New Year, Musius evacuated Alexandria with a small number of Roman legionnaires aboard a few ships.

His lieutenant led the remaining Roman soldiers, Egyptians, and reinforcements from all over the country who had no way to escape, to surrender to the Han army, and Alexandria officially changed hands.

The province of Egypt, one of the most important provinces of the Roman Empire in the East, officially fell to the enemy.

Lü Kang announced the establishment of a new Viceroyalty of Egypt, which governed the former province of Egypt, and appointed Sima Yi as the first Governor of Egypt.

At this point, all the provinces of the Roman Empire in Asia were divided between the Han Empire and the Persian Empire, and except for the European part of the mainland, the Roman Empire was left with only a few provinces on the Mediterranean coast of North Africa.

The situation in these provinces was also precarious, because their garrisons were all in the battle to reinforce Egypt, and were completely annihilated by the Han army, and the internal defenses of the provinces were empty.

They were intrigued by the emerging Persian Empire, and Ardashir I dreamed of restoring the grandeur of his ancestors, the Achaemenid dynasty.

So he was determined to succeed in these North African provinces, and his son Shapur was gathering his army to march into Cyrenaica.

According to the agreement between the two sides, after the successful occupation of Egypt, the Han Empire stopped its military operations in this area and devoted all its energy to pacifying the Egyptians.

In addition to leaving five divisions of troops to garrison Egypt, the rest of the army returned to Damascus, which was the two major military bases of the Han in the Middle East.

The Persian Empire leased these two cities, including thousands of square kilometers of surrounding land, to the Han Empire as military bases.

Before the opening of the canal, the Han Empire was not able to cross the Mediterranean to attack the Roman Empire itself, so the military campaign against the Roman Empire came to an end for the time being.

In addition to retaining a few divisions of the necessary troops to garrison Mosul and Damascus, more Han troops, especially those with heavy combat casualties in the early stage and those who had served overseas for a longer time, returned home with Lü Kang and Ma Chao.

They were joined by a large number of domestic engineering experts and construction teams, including engineers from the Wehrmacht and road construction teams from the Ministry of Communications.

They will go to Egypt to explore the specific route of the canal, the construction plan, and calculate the amount of work required.

The naval fleet of the Han Empire has long arrived at the port of Suez, and according to the plan of the Navy of the Han Empire, the navy will maintain the size of the two-ocean fleet, the Pacific Fleet and the Indian Ocean Fleet.

The Navy's goal is to use the two-ocean fleet to control the Pacific coastal areas and the Indian Ocean coastal areas, and in addition to a dozen overseas military bases as support points, it is the newly built large-tonnage ocean-going warships.

The ocean-going fleet has eliminated 500-ton warships, the smallest is also 800-ton warships, the main force is naturally the 2,000-ton Imperial-class sail battleships, and the Pacific Fleet and the Indian Ocean Fleet each have three Imperial-class.

The naval commander of the Indian Ocean Fleet was Lu Su, who was awarded the rank of admiral, a military rank system that had just begun to be implemented in the Han Empire in place of the original official rank system.

The military rank system is conducive to the regularization of the armed forces, to the coordinated operations of all branches of the armed forces, and to distinguishing military ranks by military ranks.

The new military rank system is divided into four classes and thirteen grades, with officers divided into generals, lieutenant generals, and major generals, colonels, lieutenant colonels, and majors, captains, lieutenants, and second lieutenants, and finally non-commissioned officers, sergeants, sergeants, sergeants, and corporals.

Further down are the small soldiers, and the soldiers are not divided, because the veterans accumulate military merits and can easily be promoted to non-commissioned officers.

With the military rank system, the military school education system has become more important and perfect.

The highest-level military academies are still two universities, the Central Army University and the Central Naval University, the Army University is still in Chang'an, and the Naval University is in Jiaozhou Bay.

Entering the university must be an officer who will be promoted to the rank of lieutenant colonel, and they will undergo a year of advanced military education to prepare them for future promotion.

In other words, these two universities are more of a continuing education nature, rather than a real university in the later sense.

In addition, there is the Central Army Military Academy, the Central Naval Military Academy, and the National Defense Forces Military Schools in the states and prefectures.

These military academies admit school-age teenagers, basically following the standard of being at least 15 years old, and also recruit non-commissioned officers and even soldiers who have made outstanding contributions, with a two-year school duration and the rank of second lieutenant after graduation.

The award system for graduates with full honors is still retained, and graduates with gold medals are directly awarded the rank of captain and choose their own service unit, and silver medals are awarded to the rank of lieutenant and choose their own service unit.

The divisions of the Wehrmacht and the two ocean-going fleets of the Navy have set up non-commissioned officer training schools to train outstanding ordinary soldiers, or veterans who have volunteered to continue their service after their service has expired, and to promote them to non-commissioned officers.

The non-commissioned officer system is one of the most distinctive reform systems of the Han Empire's army, which greatly improves the quality and cohesion of the soldiers at the lowest level and ensures the long-term combat effectiveness of the Han Empire's army.

The commander-in-chief of the army of the Han Empire was, of course, Lu Bu, who did not give himself any military rank, such as marshal, and he felt that the emperor himself was the highest military rank.

In addition to him, all army generals, whether they are the commanders of front-line units, civilian officers of the General Staff, or even intelligence officers of the Ministry of Intelligence, have corresponding military ranks, which are also convenient for management and command.