The classic shape of "Captain Jack", as well as the funny lines, left a deep impression on the Portuguese sailors. These legends, which later spread within Portugal, became legends. However, at the moment, the Portuguese sailors were also in shock, and they had to return to Portugal first.

At the same time, the Beihai Kingdom also began intense preparations. This time, "Captain Jack" was sent out, although it was to make up for his own losses. But God knows how the overconfident Portuguese will mess around. The perennial flaunting of their military might at sea has made Portugal forget the essence of being a small country, and their self-confidence has swelled.

So, once again, Marin began to promote the two powerful batteries at the mouth of the Ames River, as "invincible". At the same time, 20 500-ton warships of the North Sea State made their first public appearance at the mouth of the Ames River, causing a huge sensation.

"Oh my God, I always thought that there were only 10 warships here in Beihai Country, but I didn't expect that there were 20!" Emden Port, exclaimed some foreign businessmen who had come to do business in the North Sea Kingdom. Of course, many of them are spies.

However, in this era, there were no professional spies in other countries. The spies among these businessmen are actually part-time and not professional. They are usually businessmen who are secretly hired by their host country to find out about the target country. Therefore, they are not professional spies, but mere businessmen who inquire about information in passing.

A spy of this level is naturally not enough in front of the full-time spies of the Beihai Kingdom. Therefore, what they can find out is generally what Marin wants them to know. Or, news that can't be hidden.

However, in this day and age, more cannot be asked for. After all, it's good enough to think of using businessmen who are doing business abroad as spies. And really professional spies, in this era, are generally subordinate to the army. In other words, it was simply an army agent, not a full-time spy. And the secret agents of the army rarely go abroad to disguise themselves as civilians to inquire about information. Unless, a big war is about to break out in that area.

In addition to the Beihai Kingdom, I am afraid that there is only the Ming Dynasty in this era, which has a professional spy - Jinyiwei. However, because of his privileges, Jin Yiwei acted a little high-profile and domineering, but he lost his forbearance as a spy.

Moreover, Jinyiwei also belongs to the military establishment, and most of the members are illiterate big-headed soldiers, and their common means of probing intelligence is to directly recruit helpers and get information from the "bag inquiry" in the market, rather than going out to get information in person like 007.

Therefore, although Jinyiwei is more advanced than the intelligence organizations of other countries of the same era, it still cannot escape the shackles of the times. Because there are not many literate people among the members, the level of business is actually just like that. Of course, there are also secret spy masters in Jinyiwei, which belongs to the very smart kind, but there are very few.

The spies of the Beihai Kingdom are different from the spies of this era, the spies of the Beihai Kingdom are all trained by schools and are all literate spies. Moreover, he has received very professional reconnaissance, counter-reconnaissance, as well as modern espionage methods such as torture, shorthand, camouflage and makeup. In addition, he can master a variety of foreign languages and is one of the top talents. If it weren't for the fact that intelligence work was very important, these spies would be more than enough to be local officials.

In addition to the 20 capital warships, Marin also had 20 Class 250 armed merchant ships follow the capital warships to act together, demonstrating the huge fleet of 40 warship formations as a deterrent.

In a show of force, Marin had the huge fleet swing around the mouth of the Ames River a few times. Then, he left the mouth of the Ames River for a "goodwill visit" to Antwerp in the Netherlands.

Why is the fleet going to Antwerp? Because Antwerp was the main distribution center for the Portuguese to sell Indian spices in northwest Europe, there were many Portuguese merchants in the area. Similarly, there were many Portuguese businessmen who worked part-time as spies.

Marin sent the fleet to Antwerp, apparently deliberately for the Portuguese merchants who were part-time spies to see, so that they could spread the news back to Portugal.

At the same time, Marin also asked the fleet to buy saltpeter from the civilian sector in Antwerp, making a posture of preparing for war. In short, all this preparation is to tell the Portuguese - I am ready for battle!

……

At the same time, 20 saurisk cannons purchased from Venice also arrived. Upon arrival, the Emden Shipyard in the North Sea State converted 20 Class 250 armed merchant ships and mounted 7,000-pound Librisk Cannons on the bow as their main guns. At the same time, various enhancements were made to the hull, and oars were added to the side side to convert the boat into a sailboat. Among them, five converted 250-class armed merchant ships were also equipped with a row of single-cylinder diesel engines, giving them the ability to maneuver without wind.

In fact, Marin originally wanted to add a row of single-cylinder diesel engines to all 20 ships. It's a pity that the manufacturing level of single-cylinder diesel engines in Beihai is too bad. In addition to the original 10 12-horsepower single-cylinder diesel engines, in a few months, only 30 qualified and durable 12-horsepower single-cylinder diesel engines were manufactured.

There is no way, limited by the level of science and technology, the single-cylinder diesel engines in Beihai are all handmade, which is time-consuming and laborious, and the defective rate is very high. As a result, more than 160 new single-cylinder diesel engines were manufactured, and only 30 were durable and could be used for a long time. Others are either unqualified at the beginning, or after running for a period of time, they always break down and cannot be used for a long time.

But none of this is a problem, at least, Marin sees progress. In the beginning, the craftsmen of the North Sea Kingdom made more than 100 units, and only 10 of them were qualified. Today, 30 of the more than 160 units are qualified, which is already a great progress. It is foreseeable that in a few years, the craftsmen of Beihai will make more and more progress, and then the finished product rate of single-cylinder diesel engine manufacturing will further increase. When a few "level 8 mechanics" come out, the output and quality of diesel engines will be guaranteed.

Subsequently, 5 diesel-powered "Dover ships" were tested at sea for naval battles. The results of the tests showed that placing the gun in the bow of the ship and firing it head-on had an advantage over the broadside gun. Among them, the biggest advantage is that if the bow gun is bombarded head-on, the ship's left and right swing will have less effect on its shooting.

When the side guns swayed from side to side of the hull, the accuracy was poor. Because, a little change in the angle of fire will lead to a big change in the accuracy of shooting.

However, if the bow gun is arranged on the central axis and fired flat, it will be less affected by the ship's sway from side to side.

However, the Venetian Limbel Cannon was not a flat-fire cannon, but a curved short-barreled mortar cannon. Despite the fact that the angle has been lowered as much as possible, the angle of fire of the mortar is still more than 10 degrees. Therefore, the shaking of the hull still has a bit of an impact on its shooting. It's just that it has a much smaller impact than on the side guns.

Moreover, the gunners of the North Sea Kingdom are not vegetarians, they will choose to fire at the moment when the hull is at its most right, and try to minimize the impact of sea conditions.

The test results of these 5 "Dover ships" were very good, and in order to observe the actual combat effect, Marlin specially bought two Caravel galleons whose life was about to expire as target ships, and let the 5 Dover ships bombard them vigorously. Then, because of the power of the shells, and the fact that the side of the ships of this era had not been strengthened, both Caravel galleons were quickly sunk......

Seeing that the effect was so good, Marin was also very confident, and ordered to produce single-cylinder diesel engines with all his might, so that the diesel-powered Dover ships would be larger and more lethal.

However, the row of diesel engines behind the "Dover ship" is too windy and inevitably coveted. Moreover, if the single-cylinder diesel engine is unfortunately hit by enemy shells outside, it is also easy to break.

Therefore, Marin came up with a way - to have a large shed cover built with iron plates at the stern of the ship, and all the eight single-cylinder diesel engines in the stern were encased in it. In this way, with the shelter of the iron shed, the eight single-cylinder diesel engines in the stern of the ship can not only be kept secret from the outside world, but also withstand the threat of enemy shells. In this era when the caliber of artillery in other countries is not large, the iron plate shed is enough to withstand the shelling of other countries......