Zhang Yi was preparing for war against Youzhou, and since Cao Pi retreated to Youzhou, he racked his brains to keep the troops in his hands. His troops in Youzhou are as many as 150,000, but Youzhou's finances simply cannot support so many soldiers.

The richest place in Youzhou now is Liaodong, because Liaodong has not experienced war for many years. The Youzhou occupied by Cao Wei is different, there has been a constant war, and it was pacified by Cao Cao more than ten years ago, but Wuhuan is still constantly making trouble, and there is not much population left. Back then, when Gongsun Chan was only left in Youzhou, he could only raise an army of 100,000, but now Cao Wei's population is not half of that of Gongsun Zhan's, but he has an army of 150,000, if it weren't for Cao Wei's remaining wealth, these armies would have been dispersed long ago.

But after persisting for two years, his last bit of wealth will be exhausted, and for another period of time, even if Zhang Yi doesn't attack, he may not be able to hold on.

Zhang Yi's spy has actually been staring at Cao Pi for a long time! When Cao Pi tried to amass wealth, the spies would destroy it, so that Cao Pi could not obtain too much wealth from normal channels, forcing Cao Pi to persecute his subordinates to collect money. At first, Cao Pi could still persevere, but later he began to use unscrupulous means.

Cao Pi is dying by himself, of course Zhang Yi will not dissuade him. Not only will he not stop him, but he will also add fuel to the fire, allowing Cao Pi to continue to move forward in the direction of death.

At this time, the sudden good news from Jiaozhou made Zhang Yi very happy.

As early as the founding of China, Zheng Chenggong began to patrol the South China Sea, cleaning up Linyi's fishing boats along the South China Sea towards Linyi. Linyi had been encroaching on Rinan County before, and it was only after Zhang Yi stationed troops in Rinan County that he suppressed Linyi's offensive. However, because of the remote location, Zhang Yi is not ready to make a move against Lin Yi for the time being, and Zheng Chenggong and others have always been on the defensive.

Later, after the founding of China and the separation of Jiaozhou from Guangzhou, Lü Fan became the assassin of Jiaozhou. In this way, the scope of Jiaozhou was streamlined, and Lu Fan's defense was more focused on Jiuzhen County and Rinan County. With the good development of Jiaozhou, many people from Jiuzhen and the west of Ninan have defected to these two counties.

From the information obtained by these Zhanren, Lü Fan learned that there was still a large amount of land to the west of Jiuzhen and Rinan, and that there was a large river in the west, and these Zhanren became the Mekong River. There are also plenty of plains on both sides of the Mekong River that can be used to grow straw. And if these lands are really taken down, they will definitely be larger than the land in Jiaozhou.

It's a pity that the population of Jiaozhou is too defensive to recruit too many troops. Zhang Yi had already given Jiaozhou a certain amount of conscription authority, but Lü Fan could only recruit less than 20,000 soldiers, and the garrison sent by Zhang Yi was only a little more than 20,000. The rest is only Zheng Chenggong's navy, but Zheng Chenggong's navy not only has to defend against naval attacks in Linyi, but also has the task of exploring the South China Sea. Therefore, Lü Fan could only defend against the attack of Linyi, and could not counterattack and expand the territory to the west.

Zheng Chenggong explored the South China Sea, but could not find hundreds of islands.

Five years after arriving in China, the history of Jiaozhou Thorn became Fu Kuang. Kuang Fu is a little worse than Lu Fan in terms of ability, after all, the experience is there. However, Fu Kuang is also a capable person, a representative of both civil and military affairs, otherwise Zhang Yi would not let him take over the position of Jiaozhou Assassin History.

When Fu Kuang took over Jiaozhou, Jiaozhou was already on the right track. As the Han people stabilized, there were more and more ships, and the number of peasants who settled in Jiaozhou also increased. There are too many ownerless wastelands here, and many of the people who fled the famine or those who could not survive in the newly occupied land occupied by Zhang Yi were sent to Jiaozhou. At the time of China's five-year population count, there were already 120,000 households and 560,000 people in Jiaozhou.

Jiaozhou grows three times a year, and 100,000 households can fully support 20,000 soldiers. There will also be a lot of surplus grain and grass among the people, plus the tax revenue of the port city, and the number of soldiers of Fu Kuangzheng has increased to 30,000, and he launched a counterattack against Linyi in the eighth year of China.

With the help of Zheng Chenggong, Fu Kuang expanded the territory to the south for a hundred miles in this battle and defeated Lin Yi. If it weren't for the lack of Fu Kuang's troops, he would have been able to destroy Linyi in one battle.

Fu Kuang's battle not only occupied the two cities of Linyi, but also captured tens of thousands of prisoners in Linyi. Fu Kuang used these people to build roads in Jiaozhou, and only by repairing the roads could they hold all places, and this road was known to the Chinese from Qin Shihuang.

After helping Fu Kuang defeat Lin Yi, Zheng Chenggong was free. He began to head south with the fleet, and he wanted to see what was to the south of Linyi.

After crossing Linyi, Zheng Chenggong found that there was still a large amount of land in the west, and there were people on these lands. There is even a long strip of land jutting out to the south in the far west.

At the beginning of the ninth year of China, Zheng Chenggong found the strait leading to the other side of the long strip, which was later known as the Strait of Malacca. Zheng Chenggong established a simple seaport on the island of what would become Singapore, where he stationed soldiers and stockpiled supplies.

In the summer of the ninth year of China, Zheng Chenggong continued southward into the Java Sea and discovered a large number of islands. Some islands are larger than Zhuya and Yizhou, while others are very small. This discovery made Zheng Chenggong very happy, these lands can be developed! And there are many indigenous people on it, and when China is unified, these places will become targets.

So Zheng Chenggong cruised back and forth between the islands, recording their locations. And send people up to investigate the resources of these islands, and collect some samples, and send them back to Shouchun to see if there is any use.

In the tenth year of China, Zheng Chenggong went around Yizhou Island from the east of the South China Sea, and only then did he realize that these islands had turned around the South China Sea. When Zheng Chenggong was replenishing in Yizhou, the officials in Yizhou were very surprised, they didn't believe that Zheng Chenggong came from the south.

Zheng Chenggong did not rush back to Rinan County, but first returned to Shanghai, his fleet had a lot of illnesses at sea, and he needed to go to Shanghai to see how these diseases could be treated.

When he arrived in Shanghai, the doctor there told him that when he was sailing, he should bring more fruit to prevent it. Of course, there are still many pharmacies for their symptoms, but they are also tonics. Zheng Chenggong saw that there was no major trouble with these diseases, so he got up and went to Shouchun to meet Zhang Yi.

When Zhang Yi heard that Zheng Chenggong had returned from the South China Sea, he immediately summoned him, and Zhang Yi was also taken aback when he saw the chart presented by Zheng Chenggong. He didn't expect Zheng Chenggong to actually produce a nautical chart of Southeast Asia, although there is a big inaccuracy, but with this nautical chart, it can still occupy Southeast Asia.