Introduction.
Throughout history, supposed war rivals have perfected their weapons, Techniques, and Tactics to defeat an enemy who violently opposes the achievement of their objectives.
In the Beginning,
The strongman appeared with a large stick or club, coming after his neighboring rival. At one point, the latter, who was practically a weakling, hid in a bush by the side of the road. When the strongman passed by, confident and well-equipped, he waited for him to leave his back free and attacked him on an unprotected «essential vulnerability.» The «big man» fell lifeless to the ground. History doesn’t say what happened to the two characters in the fable.
When the number of members of the two factions increased enormously, they instinctively sought to group together, so they could attack and defend themselves much better.
At first, there was a relatively large group, and soon the focus was on organizing and utilizing the group. And the phalanx was born, a wall of twelve or sixteen ranks of men armed with long spears or pikes, extending several ranks ahead, well-trained in their combined handling at close range. They were protected by a large shield and pieces of metal or heavy leather on the chest, head (helmet), arms, and legs.
In ancient Greece, the Spartans refined the tactical instrument of the phalanx to the fullest.
No one was as trained and protected as they were. And their society accepted and honored their militari ethos, embodied in the phalanx. Spartan mothers would tell their sons, phalangist hoplites, to «return with the shield or on the shield.» There was no quartermaster or medical care, properly speaking. And mothers instilled in their sons the warrior social mentality of their society.

But, behold, the right wing of the phalanx was less protected than the left. This was due to the way the men naturally protected their left flanks with their shields.
And at Leuctra, around 344 BC, Sparta, with a majority of its forces (10,000 men), set out to crush Thebes (6,000 men). Unaware that its phalanx model had changed,
Epaminondas and his pair, Pelopidas, had introduced the «oblique order» into their Theban phalanx. On their left wing, they deployed a greater number of forces, and the best of them. Among them, a phalanx formed by homosexual couples, which they called the «Sacred Band.»
They also refused to employ their center and right wings, as is typical of the oblique order. Perhaps the heightened sensitivity of homosexuals, which is said to be present in the Theban homosexual leaders, may have influenced their sharpness and refinement.
On the Spartan right wing was the commander of all their forces. This was thus the «core of their resistance.» And this was battered and beaten by the Theban forces on their left wing. And then appeared the «Caedes,» the slaughter and the finish of the vanquished.
From afar, the Spartans on their center and left were also affected by the defeat and the damage to the hoplites on their right wing. And they began to retreat, without having been defeated by weapons.
A year after Leuctra, Epaminondas was touring the Peloponnese peninsula, commanding forces of the newly formed Arcadian League. And he appeared in front of the city of Sparta, within whose sight, it was said, enemy forces had never appeared.
Phalanxes were too large to be able to move freely and quickly against the enemy. They acted as a «dam» of Force against Force, where surprise, skill, and flexibility could not exist. Another characteristic of their technical rigidity is that they had to fight on flat terrain, at least without undulations or obstacles such as rocky outcrops or patches of trees and bushes, which broke their structural continuity.
Rome meets the Greek phalanxes.
The Romans had a military structure based on the legion, as a large operational unit, of about 5,000 men. The legions were made up of maniples or, much later, cohorts, small tactical units capable of moving and maneuvering on the battlefield, gaining the flexibility, skill, and surprise that phalanxes lacked. And their centurions, one to the right and one to the left of the first row of the maniple, and their officers were capable of leading them individually.
At the Battle of Pydna, in June 168 BC, a battle took place between the Romans led by Aemilius Paullus and the Macedonian Perseus. The Macedonian phalanx vigorously attacked the Roman formation of two legions and forced it back toward the fortified Roman camp. However, the terrain was uneven and somewhat rocky, and as it advanced, the phalanx lost its solidity and integrity.

Seeing this, Paulus gave orders to the maniples (centurions) to act independently on the enemy phalanx. The centurions then took command. The maniples advanced and began to take advantage of the smallest gap in the enemy’s pseudo-compact formation to introduce their men there.
They began wreaking havoc with their gladius (somewhat short Roman swords, prepared for close combat) on the defenseless flanks of the Macedonian hoplites, armed with long pikes.
Soon, Aemilius Paullus launched the Second Legion against the center of the enemy line. It shuddered and finally gave way. The Greek spearmen were now nothing more than a hindrance, both in fighting and defending. The Roman legionaries vigorously launched themselves into the attack. And then came the Caedes, the massacre, the collapse of the formation into a shapeless mass, terrified and fleeing individually.
When the sun set, Paulus halted exploiting his success. The death toll showed one hundred Romans and twenty thousand Macedonians had finally fallen.
The Mongols threaten Central and Eastern Europe.
At the beginning of the 13th century, the Mongols, nomadic tribes from the interior of Asia, who dominated mounted combat and had a very elaborate and simple military organization, appeared for the first time on the borders of eastern Europe.
Their logistics were simple and involved supplying on the ground they trod, following the broad pastures as they advanced, each rider carrying several mounts with him.
The Mongols started from their strategic zone, defined by the «advance and location» of their nomadic settlements, their yurts or nomadic houses, pulled by oxen, never observed or suspected by their enemies, and reached the tactical zone with them. Their operations did not require the physical and mental support of the operational zone, the transition for the forces and their support between the strategic and tactical zones.

In front of the discontinuous front of their enemy positions (cities), there is a wide, unprotected, and empty area, uncontrolled by anyone, which the Mongols make the most of for their operational approach. Their enemies, the feudal heavy cavalry forces and their infantry spearmen and archers, maintain nothing resembling advanced detachments, which make mobility reconnaissance and repel the Mongol advance parties of reconnaissance and combat.
The Mongols’ concern toward the enemy was generally strategic, considering their «exposed flanks» at the level of the «occupied» countries. This concern stemmed from their always small numbers for the objectives entrusted or sought.
And from the real tactical no invincibility of their forces, if they encountered an organized, skilled, and, above all, calm enemy.
In 1221, after conquering the Muslim Empire of Samarkand, located between the Syr Darya and Amur Darya rivers, Genghis Khan systematically plundered Afghanistan. His son Tilui slaughtered most of the inhabitants of northern Persia. With no possible live enemies on their strategic flank, they protected the southern flank of the Mongol Empire.
(To be continued)