To accurately describe the topographical features of the Ardennes region, perhaps the simplest analogy is a shrunken version of China's great southwest region, that is, the kind of environment where "the land is not three feet flat".

Under the construction management of the pre-war consortium, the road network in the Ardennes region was quite developed relative to the number of inhabitants, and even the rural roads were in very good condition. But there is a problem with this, and that is that most of the roads in the area are two-way single-lane, that is, the kind that can only accommodate the width of two 4-ton trucks side by side. Although all roads are designed to be able to carry 70-ton heavy tanks, the width of the roads undoubtedly limits the flow of traffic, which can cause traffic jams if large forces rush in.

It's not that the consortium didn't think about solving this problem, but in the end it gave up. In order to avoid overdevelopment, Charlemagne's attention was one of the reasons, and the other reason was the topography, you must know that some roads were built by blowing gaps in valleys and valleys. If all roads were to be upgraded to a four-lane highway large enough to accommodate the rapid passage of army groups, the cost would be unbearable.

Army Group B has a total of 1,250 combat vehicles and more than 40,000 motor vehicles, plus various auxiliary units, and if the whole army is lined up on the road, it can discharge a 1,540-kilometer steel long line. At present, measures such as traffic control and rationalization of road allocation are being implemented. But the main force of the corps basically marched along the only four four-lane roads, and the marching column on each road was still 400 kilometers long!

If the opponent has strong enough air power, the mechanized troops crowded on the road and cannot move will undoubtedly be a live target, and the most powerful armored corps in the world can be turned into a pile of burning scrap metal with a single bombardment. Even if this happens, the delay will be enough to completely bankrupt the "revolving door" that strictly adheres to the schedule.

Roland didn't have the strength to annihilate Army Group B, and even if he did, he didn't want to over-irritate the Wehrmacht and even "someone" who had the ability to restart the world, all he could do was to delay the pace of the "revolving door" - that is, to slow down the advance of the armored cluster by destroying the road.

This is no easy task, except for the comprehensive response plan of the Defence Force and the efficient support provided by its strong industry. Those roads are a big nuisance in themselves.

Those who think that it is enough to blow up a bridge and plant a bomb on the road are basically at the level of rookie guerrillas. This kind of tactic may be able to play a certain role in the situation of low infrastructure construction and low mechanization, organization and logistics support capabilities of the enemy, such as the battlefield behind enemy lines during the War of Resistance Against Japanese Aggression. It would not be feasible to put it on the European battlefield of the same period. Before the Battle of Kursk in 1943, the guerrillas in the German-occupied areas were unprecedentedly active, sparing no effort to sabotage the railways and highways under the control of the Germans, but the Germans were still able to move troops and equipment to the front line on time before the campaign was launched through reasonable scheduling; another case was the battlefield on the Western Front after the Normandy landings, in the face of the scorched earth tactics adopted by the Germans when they retreated, the Americans with deep pockets still built various bridges and paved roads, all the way into the German mainland.

Roland's problems are more troublesome than in the above cases. High-grade heavy-duty roads and bridges are as strong as reinforced concrete fortifications, and to destroy these roads, it is necessary to have blasting construction personnel who are proficient in professional knowledge, as well as sufficient explosives and professional construction equipment. After sufficient mapping and exploration, the blasting site can be selected before drilling and blasting operations can be carried out on specific road sections, including the roadbed. However, Roland had neither the professional equipment nor personnel at his disposal, nor the time and possibility to carry out such a large-scale operation under the noses of the Wehrmacht. Even if he succeeded in blasting, in order to defend the support capacity of the garrison, it was not difficult to use the prefabricated steel structure steel plate to build a section or even a dozen sections of steel plate road that could pass through the combat vehicles like building an emergency runway at an airport, and it would only be delayed for a few hours at most, and it was still far from the whole day or even two days he expected.

Therefore, he chose to use a large-scale operation to trigger the phenomenon of soil liquefaction, turning all the key sections of the Ardennes into a mud pit, and blocking the "revolving door" that had been activated by changing the terrain and landform.

Soil liquefaction mostly occurs after earthquake disasters and is a secondary disaster phenomenon. Under normal conditions, the pressure of groundwater and the pressure between the soil layers will be maintained in a balanced state, and the groundwater and the soil layer will remain stable and will not invade the soil layer above. However, when an earthquake occurs and the surface is affected by stress, the soil binding force decreases, the pressure and permeability of groundwater continue to rise and accumulate, and when the pore water pressure of the soil increases enough to suspend the soil particles in the pore water, the bearing capacity of the soil particles will be replaced by water, and the inside of the soil structure will become like a liquid that can flow, and eventually lead to the loss of bearing capacity and a large number of deformations of the entire site, becoming a large quagmire that erupts sand and mud - this is soil liquefaction.

The area of the liquefied soil layer is full of flowing mud, and all mechanical vehicles, including construction vehicles, let alone combat vehicles and trucks, are inaccessible. In addition, due to the inability to determine the depth of the mud pool and the flow rate of the sediment flow in a short time, and the geological structure as a whole is in an unstable state, it has become very difficult to build a steel structure bridge. In order to repair the road to the point where it can be repaired by heavy vehicles, heavy pile drivers and washing equipment must be airdropped to forcibly tamp the entire road's foundation, and then gradually poured steel frames and cement to stabilize the foundations, and then the road is rebuilt...... The whole process was carried out by the professional construction team in three shifts, and it took a week to build a simple cement road at the earliest. If there are any landslides and mudslides in the middle (these two secondary disasters are prone to occur in the soil liquefaction zone), the progress will not be guaranteed.

Even if Yalfheim were to mobilize the air force rush to mobilize the troops, they would have to spend a whole day coordinating and transporting them because the roads were already blocked. Against the backdrop of the time of the warring parties, this day is enough time to change a lot.

"A rapid increase in the concentration of interfering particles was detected. ”

"There was a murmur in the resonance array. ”

"On the fourth day, the crystal array was launched. ”

"The murmur is reduced, and the synchronization of the procedure is restored to within the tolerable threshold. ”

"In the seventeenth stanza, the chant begins. ”

The loud voices of the magicians sounded in the cabin of the "Endeavour", and around the two machines, the precise and complex geometric luminous figures expanded and changed in an orderly manner. Wrapped in a white armor that emitted a pulsating red light, the "girl" received the analysis of the state and gave corresponding instructions, her voice calm without hesitation or hesitation.

This is the result of countless repeated rehearsals.

The mountainous area, many rivers and many groundwater in the Ardennes region have the potential for soil liquefaction, but its soil composition is not sandy or silty soil that is prone to liquefaction. Unless the seismic intensity is quite high, such as a Li-style earthquake of magnitude 6~7, it is possible to produce soil liquefaction in some areas. However, in an environment where the defense forces are tightly deployed and the interference particles are dense, it is completely difficult to launch a strategic-level technique equivalent to a natural disaster.

The only feasible way to break through this predicament is to lurk on the scene, resonate with the Celestial Crystal that is pre-embedded in key areas, and release low-frequency vibrations to trigger local soil liquefaction and block the steel torrent of the defense forces.

"I just didn't expect that I would use that guy's technique in the end......"

During the short pause, Roland couldn't help but let out a melancholy feeling, thinking of the source of the technique used in this battle-the dark red long knife linked to his many unpleasant memories, and no one could help but sigh at this evil fate that entangled too many things, let alone him as a party.

Taking a deep breath, Roland once again focused on the fine-tuning of the technique, and at the same time, in the corner of his consciousness that linked various information, a point of light on the large combat map was rapidly approaching the dot marked "Bastogne" on the map.