The tactics of attacking the enemy army hidden in underground fortifications are more feasible than the following in the history of the world: earth attack, cave attack, water attack, fire attack, and smoke attack (poison attack).

Let's start with the earth attack.

Earth attack is a tactic that uses earthwork or other materials to completely bury the enemy's underground fortifications, so that the enemy hidden in the fortifications is trapped and dies underground. This eliminates the need for direct engagement and contention with the enemy, and can greatly reduce our casualties.

In the Battle of Iwo Jima in 1945, the U.S. military dispatched more than 900 warships, more than 2,000 aircraft, and a huge force of 220,000 troops to attack Iwo Jima, which was defended by only 20,000 Japanese troops.

Judging by the data on paper, the US military has an absolute advantage. However, in the actual battle, the Japanese army was very well prepared, and they built a large number of fortifications on the island, mainly underground tunnel positions, and an organic combination of concrete fortifications and natural caves. This made the US troops who landed on the island fight very hard.

At the cost of 26,000 casualties, the U.S. military continued to fight hard for 36 days, and it was difficult to completely clear the Japanese fortress.

Later, the U.S. military changed its tactics, they transported batches of quick-drying cement and other building materials ashore, and also converted many tanks into bulldozers, sending tons and tons of concrete to the volcanic rock caves that were built into bunkers, completely blocking these holes, and the Japanese troops inside were completely trapped.

In this way, the American army easily turned 180 bunkers into the graves of the Japanese army, and the fortress, which was almost impossible to conquer, was now conquered by hundreds of tons of cement. After that, the U.S. forces quickly cleared the Japanese troops on the island and won the final victory in the Battle of Iwo Jima.

This is a standard example of using earth to attack the enemy army in underground fortifications, and of course, its success is inseparable from the support of the strong logistics capabilities of the US military.

The second is the cave attack.

Cave attack is the digging of passages into the enemy's fortifications, so as to avoid the enemy's heavily fortified front. However, in addition to the surprise effect of the initial attack, the cave attack still needs to engage in fierce hand-to-hand combat with the enemy later.

In this year's reconquest campaign of the Big-headed Ant Kingdom Expeditionary Force, the protagonist once suggested and implemented the burrow attack tactic, directly dug the passage to the bottom of the paving ant barbarian army's nest, and the protagonist killed the opponent's ant queen in one fell swoop. After that, the passage turned into a floodway during heavy rains, completely submerging the enemy's nest and changing from a hole attack to a water attack.

The third is water attack.

The position of the underground fortifications must be below ground level, and as long as the diversion channel is dug reasonably, the Seventh Army can be flooded. Unless there are reasonable and adequate drainage facilities in the underground fortifications, they can be protected from flood misfortune.

Like the example of the protagonist who just mentioned the water attack on the paving ant barbarian army's lair, this is a success story.

But there are also cases of failure, such as in the classic movie "Tunnel Warfare", in which the Japanese army wanted to pump well water and flood it to attack the guerrillas in the tunnels. However, the drainage of the tunnel was also connected to the well, and all the stagnant water was discharged back into the well, which also bankrupted the enemy's plot.

The fourth is fire attack.

The tactics of attacking the enemy army with fire have existed since ancient times, and there is even a special "Fire Attack Chapter" in the "Art of War", which says: "There are five types of fire attack: one is called the fire man, the second is the fire accumulation, the third is the fire carry, the fourth is the fire store, and the fifth is the fire team." It can be seen that at that time, there was already theoretical guidance for fire attack tactics, and there were subdivided tactics and tools.

In World War II, the U.S. military was heavily equipped with M2A1-7 and M2-2 flamethrowers. In the Pacific War, the U.S. military often used flamethrowers to kill and wound a large number of Japanese soldiers (or unlucky Japanese soldiers) hidden in trenches and fortifications.

In many brutal battles for the islands, many Japanese troops hid in the winding tunnels and resisted stubbornly, in order to eliminate the remnants of the enemy, the American army used flamethrowers, and even if the flames sprayed by the flamethrowers could not directly contact the hiding Japanese troops, the burning oil would deplete the oxygen in the caves or fortifications, suffocating the Japanese soldiers.

Modern cloudburst bombs are also excellent weapons for killing and injuring people in confined spaces such as underground fortifications. A cloudburst is a fuel-air munition that is equipped with fuel instead of explosives. The destructive effect on the target after the explosion mainly depends on the overpressure and temperature field effects generated by the detonation, as well as the scouring effect of the high-temperature and high-pressure detonation products. Its lethal effect is greater in confined spaces, so it is often used to hit living targets in buildings and bunkers.

Finally, there is the smoke attack (poison attack).

This tactic is to weaken the enemy by choking or even poisonous smoke, and even force the enemy to abandon the strong underground fortifications and flee.

Many gunpowder formulas in ancient China contained croton and arsenic poisons, which relied on the toxic smoke produced to enhance additional lethality.

During the First World War, both sides built a large number of trenches and underground fortifications in their defensive positions. In order to break this trench defense system, both warring sides successively used poison gases such as chlorine and mustard gas. Even after the appearance of gas masks, the effect of poison gas was amazing. In addition to inflicting a large number of casualties, gas bombs can also weaken the enemy's morale. So much so that after the war, international treaties explicitly prohibited the use of chemical weapons such as poison gas in war.

Before this battle, the protagonist plans to attack the new nest of parasitic ants at night. These five tactical protagonists have also been studied in turn.

In the case of soil attack, ants are already good at digging and nesting, and even if the entrance and exit of the nest are blocked, the parasitic ants can dig through again without much effort, or find another place to build a new entrance.

Cave attack, in addition to being able to fight a surprise attack at the beginning, after that, the Divine Envoy King Legion still has to fall into a street battle with the parasitic ant warriors, the enemy's individual combat effectiveness is obviously stronger, even if it wins in the end, the loss of the Divine Envoy King Legion will be great.

If you don't think about the terrain, water tapping is a good idea. Unfortunately, the location of the parasitic ant nest is too superior, located in the middle of the hill, at a high altitude, and there is no suitable water source nearby. Even when it rains heavily, it is difficult for this parasitic ant nest to get water.

In the case of fire, with the technical conditions of ants, there is no other fuel available except for natural materials such as dry twigs and insect grease, and even the original "Greek fire" cannot be made. The protagonist can't order his subordinate soldiers to rush in with a ball of fire, so kill a hundred enemies and lose three thousand.

After thinking about it, the protagonist still thinks that the smoke attack is more reliable.

There is no limit to the technical conditions, and the ants have mastered the use and preservation of fire, which is nothing more than to light a fire and then pile up smoke materials on it. The simplest smoke material is a plant that contains water, and if you add some insect droppings, the effect will be even better.

The protagonist looks at the entrance to the dark parasitic ant nest: "This time, I have something good for you!" ”