The conquest was quickly put on the agenda, and although some generals put forward different opinions, Liu Yin still insisted on conscripting the Japanese despite public opinion. Pen % fun % Pavilion www.biquge.info

However, cross-sea operations are different from land operations, first of all, ships, although Sanhan and the Japanese have exchanges, but the ships used are relatively small, and they cannot be used as warships, and the Han army wants to conquer the Japanese, the first thing that must be solved is the problem of warships.

Although the Tsushima Strait is not too wide, the climate is complex and changeable, and the ocean currents are unpredictable.

Ordinary boats crossing the river are actually all up to luck, and when the weather conditions are good, they can cross smoothly, but in the event of typhoons and bad weather, they can only be resigned to fate.

However, in the process of crossing the sea for a long time, those business travelers who travel between the two sides of the strait can still find out some experience, relatively speaking, there are often strong winds in winter, and there are often typhoons in summer and autumn, only in March and April in spring, the climate is relatively stable, and it is the best period to cross the sea.

It's late autumn now, and there is only about half a year before next year's transition period, so in terms of time, it is still quite urgent.

Liu Yin immediately ordered to gather shipbuilding craftsmen from Youju and Cheongju to go to the port of Busan, Samhan.

According to the level of the boat, Ji Han is definitely inferior to Wu Guo, but Qingzhou and Youzhou are near the sea, and there are often fishermen who go to the sea to fish, and these fishing boats are very suitable for sailing in the sea.

There are still different methods for the construction of river boats and sea boats, such as the five-story large building ships built by Soochow, which are simply unusable at sea, and when a strong wind blows, they capsize immediately. Seagoing vessels generally have a wide bottom and low sail height, so that they can sail unhindered at sea.

The shipbuilders summoned from Qingzhou this time did not take the land route, and directly boarded the ship from Chengshan in Jiaodong, Qingzhou, crossed the Yellow Sea, and arrived at Sanhan. Taking the sea route is at least two-thirds less time than taking the land route, and it also proves that the current level of shipbuilding can fully meet the needs of sea-crossing operations.

Samhan area is mountainous, with a large area of primeval forest, which obviously provides convenience for shipbuilding, limited to the inconvenience of transportation, ancient shipbuilding is generally local materials, the best of the best, Samhan and Liaodong climatic conditions are similar, tree species are also roughly the same, pine, cypress, elm, fir trees are not lacking, which also provides convenience for shipbuilding.

Liu Yin currently has more than 100,000 horses of the Han army, 50,000 troops of Fuyu Kingdom, 50,000 troops of Goguryeo, plus the three Han Minfu who can be mobilized at any time, the labor force is absolutely rich, and the timber piled up in the port of Busan is simply a small mountain and majestic.

According to Liu Yin's requirements, the ships built this time are large, medium and small third-class, the large ship is three zhang wide, up to more than ten zhang, can be used to transport horses and large equipment, the medium warship is about one zhang wide, five or six zhang long, and the small warship is seven feet wide, three or four zhang long, all of which are used to carry troops.

According to Liu Yin's requirements, one sea crossing only needs to be able to carry 10,000 people, like a large warship can carry 3,500 people at a time, a medium-sized warship can carry 100 people, and a small warship can carry 50 or 60 people. Therefore, only a dozen large warships were built, and 50 and 80 medium-sized warships and small warships were built respectively, and these warships could basically meet the needs of the Han army to cross the sea.

More important than warships is logistical supply, and the requirements for logistical supply in cross-sea operations are unprecedentedly high. The expedition itself to the Wa Kingdom has already created a record for the longest distance of logistics supply, and crossing the Tsushima Strait is like a bottleneck for logistics transportation, just imagine that after the army of 100,000 or even 200,000 troops crossed the sea and landed, all the grain, grass and baggage supplies will need to be carried out through the Tsushima Strait, if it catches up with the calm season, it will be better, but once the war drags on, it will be a very difficult thing to transport materials through the Tsushima Strait.

The soldiers and horses have not moved, and the grain and grass go first, which is the prerequisite for any military operation to be carried out first, so while building the warship, Liu Yin put his main energy into raising grain and grass materials to ensure the supply of logistics.

With the full support of the imperial court, the grain, grass and material resources allocated from Jizhou and Qingzhou and Youzhou continued to pour towards the Samhan area. This time, Fu Yuguo not only sent 50,000 troops to accompany Liu Yin on the expedition, but also funded a large amount of grain, grass and materials. Liu Yin also raised a lot of grain and grass in Lelang County, Obifang County and Samhan area, and after a winter of preparation, the grain and grass materials delivered to the front line could already meet the expenses of all the armies for half a year.

With the passing of the cold winter, the sea breeze that had raged for a winter finally weakened, and the final preparations for the Han army to go to the Wa Kingdom were nearing the end.

Since Liu Yin's infantry cavalry and the Goguryeo army were basically landlubbers, it was not ordinarily difficult to train these armies into sailors, so Liu Yin did not bother in this regard, but recruited thousands of fishermen from Qingzhou to act as sailors.

These fishermen have a lot of experience at sea, even if the warships built by the Han army are slightly larger than the fishing boats they usually use, but the principles are similar, after a winter of training, these newly recruited sailors can already skillfully control the various types of warships of the Han army.

These warships are actually landing transport ships, which only need to transport the Han infantry cavalry to the opposite Japanese island of Kyushu for landing, and there is no need for naval battles at all, which virtually reduces the training requirements of the navy. As long as these sailors master how to control the ship, the rest is basically none of their business.

The troops for this landing operation were also screened in advance, after all, the sea was stormy and rough, and those seasick soldiers would not appear in the first wave of attacks.

The first echelon of the attack is to select soldiers who are familiar with the water as much as possible, and they are fully capable of amphibious attack tasks, and the first wave of attacks should seize the beachhead and provide a landing channel for the troops to continue the land, so it is the most elite infantry in the Han army.