To build a pontoon bridge, you need to prepare floating objects so that the bridge can be fixed on the water later. Whether it is a pontoon bridge across the river or a pontoon bridge across the sea, this is not the case.

And ants build pontoon bridges, unlike humans, there are still many restrictions.

For example, when it comes to the choice of floating objects, ants don't have much choice. Humans can use man-made boats, rafts, and pontoons as floating objects, which are obviously difficult for ants to make with the current state of technology.

Crafting a boat, even the simplest canoe, requires tools such as stone axes and fire, as well as a certain amount of strength. The protagonist has mastered the art of fire, but is very backward in terms of tools - the hardest ones are the ant's own jaws and some sharp pottery knives, which are obviously unable to handle solid wood.

And even with advanced tools, using them with the strength of an ant to process wood is not much more efficient.

This is true for boats, and the same is true for pontoons. In this way, the most suitable for ants to build pontoon bridges is the floating objects made of natural materials and their simple processed products.

For example, natural branches and bamboo branches. Natural branches can float steadily on the water surface after they are dry, and the hollow bamboo branches with bamboo knots at both ends are suitable natural pontoons.

Or simply tie these branches and bamboo branches into a bamboo raft with ropes, which is more effective.

With these two types of floats or bamboo valves, it is only necessary to find the right material, although the ants lack the ability to cut the material directly from the bamboo, but every year there are branches and bamboo branches that are broken by the wind and fall to the ground. If the ants collect carefully, I believe they will still be able to find a lot of materials of the right size.

It's just that now it's freezing cold.,In addition to the protagonist can move freely in the wild.,The other big-headed ants can only cower underground until the beginning of spring next year.。 The search for floating debris materials has only been delayed for a few months.

The protagonist then thinks that with floating objects, it is necessary to tie and connect the floating objects with ropes, and to build a bridge deck with bamboo and wood branches on top of the floating objects, which is not a small project.

A pontoon bridge, if you take into account the impact of the current, will not be in a straight line on the river surface, but will stretch slightly downstream into a bow. After calculation, the length of the pontoon bridge required to cross the river is at least 30 meters, and if the bridge deck is one decimeter wide, it is simply estimated that the bridge deck needs three square meters of bamboo and wood materials. Coupled with the demand for floating objects, the total demand for bamboo and wood materials is not a small number for ants.

Combined with the ropes used up, the time spent searching and processing materials, the construction of such a small pontoon bridge would be no less than the construction of a new nest.

In addition, it will not be possible to start construction this winter, and after the restoration of the war is completed in the spring of next year, the pontoon bridge, the river crossing, and the construction of new nests will probably be completed in the autumn.

There is also a difficulty, even if the big-headed ants have built a pontoon bridge on the south bank of the river in advance, how can they build the pontoon bridge to the opposite bank without companions?

The first method that the protagonist thinks of is that the big-headed ant worker ants continue to push the pontoon bridge into the water on the south bank of the river, and with the thrust of the current, the continuously extended pontoon bridge is pushed downstream diagonally to the opposite bank.

But this is too idealistic, not to mention whether the length of the pontoon bridge will be increased, and the consequent increase in material consumption and engineering volume. Let's just say that the pontoon is essentially a rope, not a long fixed stick, and more likely, the pontoon that is pushed into the water will lose its direction, become uncontrollable, and never reach the opposite bank.

The second thing that the protagonist comes up with is also a bit whimsical: he crosses the ice and sees the frozen corpses of water spiders, indicating that there are water spiders on the river. In addition, there are also water spiders in the large lake east of "Dongyang Castle".

If you can domesticate the water spider, you can not only let the water spider pull the pontoon bridge to swim to the opposite bank, but also build an active water spider knight regiment on the water surface to perform various tasks such as transportation, reconnaissance, and guerrilla. In addition, the Water Spider Riders, who are active near the water's surface, have little threat from the enemy as long as they are not careless and fall into siege on land.

The uncertainty of this method is that it is uncertain whether the water spider will be domesticated smoothly, and how long it will take. It is also unknown whether water spiders will be able to reproduce artificially.

Since there is water transportation, of course, there can also be air transportation, and the third method of the protagonist revolves around air transportation.

The flying knights have been in the army for more than half a year, and they have been proficient in all kinds of training. What if you use the fly mounts of the Flying Riders to pull the pontoon to the other side?

But the protagonist rejects this idea, the flies themselves are not strong, and they can't focus in the air, just the dozens of flies of the Flying Knights may not be able to pull the huge pontoon, and maybe they will be dragged into the water and fall into danger.

If you want to propel a pontoon, you need a larger, more powerful flying insect. Most insects can fly, but only some insects specialize in flying, and only a few species such as dragonflies and large bees meet the conditions of the protagonist.

Like water spiders, it is questionable whether these insects can be domesticated, and dragonflies that are good at flying are not easy to catch, and wasps, bears and other bees also live in groups, and ants trying to attack the hive to catch bees may pay a lot of casualties.

In the end, the protagonist suddenly suddenly realizes - why can't I get the preparations done first while the winter is in the winter?

Worker ants really can't go out in winter to search for materials and make pontoons. However, there are a large number of plant fibers in the "Waterfront City" that weave ropes, and then they can complete the rope braiding work in the nest**.

And the protagonist can be active in the wild, and he still has a lot of strength, so he can fix one end of the rope on the south bank of the river when the river can be passed in winter, and move one section to the north bank of the river and tie it up. This will allow the rope to be used for subsequent construction work in the coming year.

The protagonist plans like this, and the more he plans, the more perfect it becomes.

Suddenly, the protagonist slapped his head again - damn it, I moved all the ropes over and tied them, what kind of pontoon bridge do I need, just walk directly on the floating ropes.

Before, the protagonist was still stuck in a mindset, thinking that he couldn't cross the river without taking the bridge, but the ants didn't have this trouble, as long as there was no strong wind, the ants who were good at climbing only needed a rope to be able to cross back and forth.

In this way, it is only necessary to tie the ropes connecting the two banks of the river higher, which can play the role of a suspended rope bridge.

Although the passing capacity of the suspended rope bridge per unit time is lower than that of the pontoon bridge, it is easy to make, not affected by winter, and more resistant to floods, so it is simply a tailor-made means of crossing the river for the protagonist!

Suspended rope bridge, it's you!