In addition to rodent mammals such as rats, voles, and marmots, which can transmit plague, infection can also occur in livestock and household pets that have been in contact with wild animals, which can also transmit fleas to humans.

To this end, William ordered that all domestic animals and household pets must be regularly disinfected and inspected, including but not limited to domestic animals such as cattle, sheep, horses, pigs, and household pets such as dogs and cats.

In addition, fur could be carriers of fleas or plague germs, which led to the prohibition of the use of furs and the entry of fur traders in the Duchy of Normandy.

Students who have studied biology know that the three major elements of infection are: the source of infection, the route of transmission, and the susceptible population.

Susceptible people have nothing to say, as long as they are not aliens, they are all susceptible people to the plague. With William's support, the Prime Minister, Count Adolph, began to carry out comprehensive control of the Duchy of Normandy, especially all public facilities in the city, hotels, restaurants, and shops, which were fully disinfected, and strict isolation of patients and their families was imposed, and those who might have come into contact with the sick must stay at home and self-isolate.

In order to control the epidemic, William divided the Duchy of Normandy into four regions and isolated and monitored. A large number of medical personnel began to be trained to replace the police in surveillance of the outbreak, while hundreds of troops and police were mobilized to cordon off the quarantine area, especially fur traders. On top of that, William decisively dismissed some incompetent medical officers and quarantine officials, and forced them behind the officials with knives and handles, so they couldn't help but care.

A series of actions were completed in one go, and under the decision to kill, the hearts of the people gradually stabilized. But in the face of the plague, it is not enough to have thunder means, but also to have a thousand golden solutions.

Although every city in the Duchy of Normandy has been quarantined, there are countless dead bodies in the city, the sanitary conditions are extremely poor, and every danger is frightening. William learned enough lessons to begin designing simple masks made of cotton yarn. The masks are easy to wear and inexpensive, and he has mobilized a lot of manpower and material resources to ensure a continuous supply of masks to the public. This kind of mask was later called "William's mask".

Masks solve the problem of transmission routes, so finally, it is time to solve the source of infection.

At that time, rodents such as rats, voles, and marmots were not many, and the real source of infection was the dead ones. Due to the high number of deaths and the shortage of timber in early spring, a large number of the dead could not be buried and were left in the streets, and William immediately demanded full cremation.

After careful investigation, the Medical Director, Dr. Marirandolph, immediately introduced the practice of cremation in various cities and settlements, and began to burn the corpses. At the same time, furniture and daily necessities that have been touched by patients in severely affected areas are also burned. After the burning, the death toll in the city dropped sharply, and the number of infected people became fewer and fewer.

The burial reform of the Norman kingdom kicked off, when the Norman had just passed through the founding of the country, and the new order had just been established, but the Christian funeral rites had long been deeply rooted in the hearts of the people, and the burial method of entering the soil was the traditional way of Confucianism, Christianity and Islam.

Although William used thunderous means to quell the conflict, the dispute between cremation and burial continued for more than a decade.

Seventy-two days later, late at night, all the epidemic prevention personnel gathered in the epidemic prevention headquarters, like the base of "Pacific Rim", looking up through the window to look up at the towering bell tower of Rouen Cathedral, and as the clock struck zero, they erupted in enthusiastic cheers. Within 24 hours, there was not a single death or infection in Normandy, and for the next few days, there were no infections or deaths.

William announced the lifting of the complete quarantine of cities in the Principality of Normandy and personally led epidemic prevention personnel into the residential areas of Rouen to visit citizens. The people took to the streets to celebrate, crying with joy, and the rest of their lives after the catastrophe were like a world away.

The Black Death epidemic in Normandy consumed more than 60,000 lives, including more than 7,200 in Rouen. In this epidemic prevention operation, more than 3,000 staff members participated and 312 people died in the line of duty. It was they who resisted the plague with their flesh and blood, and used their lives to gain valuable time and research materials for those who came after them.

The plague in Normandy was over, but William's work was not over, and the Norman kingdom was not only the Duchy of Normandy was the most important, whether it was the rich Flanders and Amiens-Wiisant, or the geographically important Brittany and Anjou, these regions were not allowed to be given up by William.

The plague will not only ravage the Norman Kingdom, the Norman Kingdom government ordered the entire fleet to be closed, and foreign ships must undergo a comprehensive quarantine and disinfection in the Channel Islands and be observed for a week before entering the port of Cherbourg, the northernmost port of the Earldom of Mortan, and the rest of the ships will be sunk.

One such merchant ship was forced to search alone along the coastline for a harbor that could accommodate it, and the romantic and tolerant Duchy of Aquitaine, Port Podore, accepted it, bringing the Black Death to France's doorstep, and the rat colony from Normandy south also introduced the Black Death to the Kingdom of France.

As the entire Norman kingdom began to take emergency quarantine measures to prevent the inhabitants of the Kingdom of France and other countries from entering the country, a Frenchman living in the Norman kingdom went to visit his relatives in the city of Reims, when it was raining heavily, and the people in the city did not let him in, so he had to cry and plead outside in the rain. When it got dark, his relatives finally couldn't take it anymore and secretly opened the city gates and took him home for the night. The next morning, the relative went out into the street...... A few days later, there were no living people left in Reims.

Within a few weeks, Paris, Orleans, Reims, Chartres, Bourges, Blois, Sens, Troyes, Dijon, ...... Everywhere the plague went, food was scarce, prices skyrocketed, morals were ruined, families were broken, churches were broken, governments were disintegrating, and the end of the world was imminent.

As the plague epidemic became more severe, even the armies of the Norman kingdom fighting in Paris were slowly retreating, preparing to evacuate this land of right and wrong.

In this way, the Norman Kingdom and the Kingdom of France reached a de facto armistice because of the Black Death, and neither dared to fight while the terrible Black Death was raging, and neither side had any desire to fight, and each withdrew its forces.

By the end of the year, the Black Death had spread almost all of Europe, and no country was spared except the British Isles and Scandinavia, which were blocked by the Channel. Moreover, even the fall of these two feng shui treasures is obviously only a matter of time.

In the spring of 1044, the long-dormant Black Death suddenly entered the Channel Islands from Calais, and the terrified King of England, Edward the Confessor, lost his usual composure on the battlefield and, following the advice of the royal physician, ordered a ban on fishing. But this proved to be ineffective: the Black Death spread to Great Britain at an unprecedented rate, and by May only 30,000 of London's original 50,000 inhabitants had left, and it was not until more than two hundred years later in the 13th century that the original number was restored.