If you want to connect Rouen in Normandy with Winchester in Wessex, you need to have a convenient seaport. Normandy and William of Rouen are not worried, Rouen is close to the port of Le Havre, the largest port in Normandy, and ships can use the golden waterway of the Seine to reach the port of Le Havre directly down the river from Rouen.

However, the port city of Winchester, Wissex, in the south of England, needs to be carefully considered, and the criteria for choosing not only the port conditions are superior, but also the proximity to Winchester in order to reduce the hassle of overland transport.

From these two conditions, William's landing place was first excluded by him, the port of Dover in Kent.

First of all, the distance between Port Dover and Winchester is more than 100 kilometers in a straight line, and the actual distance will only be longer because of the backward traffic conditions at this time.

Secondly, the defense capability of the port of Dover is also very poor, William can land from the port of Dover and nearby ports, then this means that other people, including the Vikings and the French, can land from here, so if William chooses the port of Dover as his target, then he must send more troops to be stationed in the port of Dover, which is very impractical.

After the port of Dover was discharged, William had two port cities as alternatives, one of which was the port of Portsmouth.

Portsmouth Harbour in the United Kingdom is located more than 100 kilometers southwest of London, west of the commercial port of Southampton, south of the English Channel, the urban area is located on Porterey Island, south of the Isle of White as a natural barrier, and the north of the main island of England is only separated by a water.

The sea area of the port area is more than 6 kilometers long and 3 kilometers wide, which can accommodate the anchorage of aircraft carrier-class giant ships, and the climate in the port is mild and calm all year round, which is easy to anchor and defend.

The important geographical location and suitable geographical environment made Portsmouth Harbour the largest and most important military base of the British Royal Navy for nearly 500 years.

In the 21st century, Portsmouth Harbour is home to the British Navy's General Headquarters, ship maintenance facilities, and accommodation and hospitals. Nearly 60 percent of Britain's main surface ships have been anchored here for a long time, including six of the 13 Type 23 frigates, and all six Type 45 destroyers, the backbone of the fleet that has just been commissioned. The two new Queen Elizabeth-class aircraft carriers of the British army will also use this place as their home port.

There are many famous warships in history, such as the ship "Mary Rose" of King Henry VIII, the founder of the Royal Navy, the flagship "Victory" of Nelson, who won the Battle of Trafalgar and laid the foundation of the "sun never sets" empire, and Queen Victoria's favorite "Warrior", all of which are preserved here for people to visit. During World War II, it became the planning and command base for the world-famous Dunkirk evacuation and the Normandy landings.

Such favorable conditions were sufficient to serve as the home port of the Norman North Sea Fleet, and the construction of a military port and a garrison in Portsmouth would certainly protect the sea frontier of England from the threat of the Vikings.

Therefore, although the geographical conditions of the port of Portsmouth are not bad, the port conditions are superior, it is only about 20 kilometers away from Winchester, and there is the island of Wight as the defense support of the port in the south, and there is no need to worry about security, but William feels that the port of Portsmouth with such superior conditions as a commercial port is too wasteful, and it is more suitable to become a military port.

The second option in William's hands is Southampton, a port city not far from the port of Portsmouth.

Southampton is a city and large harbor on the south coast of England, located in the center of the south coast of England, along the Solent Gap in the English Channel, between the mouth of the two rivers Tayster and Echin, the harbor is wide and deep, and the Isle of Wight is a barrier.

In the Middle Ages, Southampton was an important port, with long high tide times and ships allowed seven hours a day, making it an important sea-going trading port in Britain and a major passenger port in Britain.

Southampton is not far from Winchester, less than 20 kilometers in a straight line, and there is a very rich river system connecting Winchester City and Wessex County, in terms of transportation conditions, Southampton Port is more advantageous than Portsmouth.

In addition, the city of Southampton has a rich history, and Southampton has been inhabited since the Stone Age. After the Roman Empire conquered England in 43, it built the city of Clausentum (present-day Bitterne Manor, Southampton) on the southwest coast as an important trading port for the Romans.

England broke away from the Roman Empire in 410, the Romans at Clausentum withdrew, and the Anglo-Saxons took over and founded the city of Southampton.

It can be seen that Southampton City is not much worse than Winchester City's historical heritage.

Southampton's rich history brings a well-developed shipbuilding industry, and it is also the starting point of the famous Mayflower and Titanic, which are well known to the Chinese.

Southampton has a rich heritage and the city with its medieval walls has played an important role in its long maritime history, dating back to the voyage from Mayflower to Titanic. Throughout history, Southampton can be said to be the 'gateway to the world' and it remains an important international maritime port.

However, the city of Southampton had recently been destroyed by the Normans as an example of William's rebellion.

Although not many lives were harmed, most of the citizens were protected and moved to other places, and the Normans deliberately avoided the important port area by burning down the city halls, town halls, and residential areas, it still took a lot of manpower and material resources and more time to restore Southampton to its former prosperous state.

Southampton would need more investment than Portsmouth to rebuild from the ruins, but William had a long-term vision and did not care about the investment at this time, which he believed would eventually pay off for him and the Normans.

William soon got into action, ordering a new Southampton city to be built on the site of the city, as well as an expansion of the docks in preparation for the future.

At the same time, for the sake of the safety of the Port of New Southampton, William decided to build a castle and lighthouse on the Isle of Wight, which is close to the Port of New Southampton and Portsmouth, and stationed troops to protect the safety of New Southampton and the Port of Portsmouth.

The Isle of Wight, an island on the south coast of Great Britain Island, borders the English Channel to the south and the Solent Strait to the north, with an area of 380 square kilometers.

The Isle of Wight is wrapped in the narrow Solent Strait, the Isle of Wight was occupied by the Vikings in history, and was the advance base for the Vikings to invade England.