The oars of the new Meng Chong are still retained, but when sprinting, they will be changed to pedal power, Ma Jun according to Lu Bu's idea, combined with the experience of his own waterwheel, and finally made a set of transmission mechanism.

The pedal power is much faster than that of paddling, and it is best used for sprinting.

Lü Bu also designed a ramming angle under Meng Chong's bow, which was somewhat borrowed from the ancient Greek ramming tactics.

Meng Chong's high-speed ramming into the enemy's cabin below the waterline was a fatal injury in this era, and it was tried and tested repeatedly, and it was a hundred shots when tested.

The second is the upgraded fighting ship, which is a double-deck warship, with several ballistae on each deck.

There are also three levers in front and to the left and right, which are a thick piece of wood that resembles a lever, and a heavy hammer is mounted on the high and erected end.

When it gets close to an enemy ship, quickly bring it down, use its own weight and gravity to smash through the deck and cabin of the enemy ship, and then twist it with a winch and reuse it.

This is a very practical weapon for the naval battlefield in the era of cold weapons.

The last new type of ship is the upgraded building ship.

Lu Bu only made a three-story ship, but he did have drawings for four-story ships, even five-story ships, and experienced craftsmen.

However, he felt that the three-story ship above the Yellow River was strong enough, and the shipyard was not that big.

Together with Ma Jun and shipbuilders, he researched a new shipbuilding method, keel shipbuilding, and began to use watertight compartment technology, which made the warships of the Central Army highly resistant to sinking.

From front to back, there are three main masts, and the sails here are the main source of the ship's driving power.

However, dozens of oars remain on the bottom floor, which can be driven by paddles when sprinting and advancing and retreating.

From the bottom to the top, the three-storey building is in the shape of a pagoda, with an unequal number of ballistae on each floor, four rotating human trebuchets in the front and rear of the middle level, and two counterweight trebuchets on the top deck.

In addition, there are one in the front and one in the front and two on the left and right, with a total of six racket sticks.

In addition, the building ship also carried 300 soldiers, which were specially used to rush to the enemy ship to fight when they were engaged in battle, which was probably the earliest Han Marine Corps in the world.

The Central Army has trained a total of 6,000 assault brigades of the Navy Army, which are used to take over and rely on help to fight, and all of them are amphibious personnel who can not only fight on land but also know how to use water.

Lou Chuan alone can imagine the manpower and financial resources invested by Lu Bu.

The chief and deputy commanders of the Yellow River Fleet were Xu Sheng and Li Meng, and Li Meng was a river and ocean thief and water coward in the middle and upper reaches of the Yellow River before Li Meng joined Dong Zhuo's Xiliang Army.

And Xu Sheng grew up by the sea, and has been a sailor and a ship boss on a cargo ship since he was a child, both of whom are familiar with water and ships.

Lu Bu personally told them a lot of methods and classic examples of fighting ships suitable for this era.

Therefore, Xu Sheng and Li Meng's concept and tactical thinking of the navy have surpassed those of the navy generals of the same era, but they lack actual combat.

Therefore, when the two sides met on the wide water of the Yellow River, the Central Army unhurriedly spread out the formation in place and did not rush to attack.

All the fighting ships and building ships of the Central Army were engaged with the enemy on the side side, and the Mengchong warships were hidden in the gaps of the fleet, waiting for an opportunity.

Fighting ships lined up in the front row, and five huge building ships sat in the rear of the fleet.

Catching the enemy on the side and seizing the T-shaped head can maximize the long-range advantage of their catapult, which is of course also taught by Lu Bu.

The Central Army is going with the current and against the wind, while the Jizhou Navy is against the current, and the warships of all sizes are desperately puffing up their sails and rowing their oars, desperately trying to get close to the Central Army.

The size of the Jizhou army's large ships was equivalent to the size of the central army's fighting ships, but they were not equipped with poles, so they could only rely on bows and crossbows to win.

The small boats of the Jizhou army are the same size as Meng Chong, and the tactics are the same, at most they use fire attack.

In the Central Army, both fighting ships and building ships are equipped with batters and ballistas, and there are trebuchets on the building ships.

The trebuchets of the navy army usually use two kinds of stone projectiles: sixty catties and one hundred catties.

The manpower trebuchet can throw more than 100 zhang with 60 catties of stone bullets, and 80 zhang with 100 catties of stone bullets.

The counterweight stone throwing machine is much farther, 60 catties of stone bullets, can throw more than 300 zhang, 100 catties of stone bullets can also throw 200 zhang.

Of course, the two trebuchets equipped on the building ship are much simpler than the same type of trebuchets in Tiger Prison, and both the volume and weight and the manpower required have shrunk a lot.

Their power and range are naturally smaller, but they are still invincible on the battlefield of the naval army.

Their bases are designed to rotate 360 degrees without dead ends, so they are installed on the top two decks.

One building ship is ten trebuchets, and five building ships have fifty trebuchets, and the side engagement, which can make these trebuchets enter combat at the same time, and the long-range firepower is maximized.

Therefore, when the warships of the Jizhou army rushed to within 300 zhang, the big guys on the building ship began to drop 60 pounds of stone bullets.

The accuracy at the beginning was naturally very low, but these large stones set off a column of water around the charging Jizhou Army warship, and the deck was wet with splashed water columns.

Guo Jia and the others' ships also entered the strike range of the stone thrower, and from time to time a stone bullet fell from the sky, stirring up a high column of water, and even grazing the side of the ship closely, wetting everyone's clothes.

Guo Jia was deeply shocked, the Central Army also has trebuchets, which is not surprising, but it is terrible to be able to throw three hundred zhang away.

Lu Bu was once again ahead of everyone, although the trebuchet was not a new invention, but Lu Bu had changed a different picture.

The Thunderbolt can throw 40 catties of stone bullets at most 200 zhang, and the Central Army can reach 300 zhang at more than 400 catties of stone bullets.

The Central Army's catapult used the salvo method when it was launched, because everyone's counterweight is the same, the size of the trebuchet is the same, and the weight of the stone projectile is the same, so the distance of the landing point should be the same, and the salvo can form a cover.

So it's only a matter of time before a straddle shot is formed, and it's a matter of time before it is hit.

Sixty pounds of polished stone bullets roared down and smashed through the upper deck was a breeze, and the warships of the Jizhou Army were all wooden structures, which were bound to be vulnerable.

Unlike the warships of the Central Army, the lower decks and waterlines of the fighting ships and building ships had a thin layer of armor (in fact, steel plates) to protect them from enemy ramming and trebuchet projectiles.

Meng Chong was protected by a thin layer of steel outside the paddle wheel at the bow, waterline and stern.

At the time of one hundred and fifty zhang, the man-powered trebuchets and the ballistae on the building ships and fighting ships also entered the effective firing range.

The density of long-range strikes covered was many times larger at once, and the battlefield of the Jizhou army was constantly hit by stone bullets and large crossbow arrows.

If you are shot by a large crossbow arrow, you can continue to move forward, and if you are hit by a stone bullet, sometimes you will even penetrate the bilge, causing a large amount of water, and the sailors on board will also break their bones and tendons.