The Knights Templar and the Art of War

The Poor Fellow-Soldiers of Christ and of the Temple of Solomon—the Knights Templar—remain one of the most iconic military orders of the Middle Ages. Founded in 1119 to protect pilgrims in the Holy Land, the Templars rapidly evolved into a formidable fighting force that combined monastic discipline with martial skill. Their battlefield formations were not static; they adapted to the changing threats and technologies of medieval warfare, moving from dense, defensive squares to extended lines that maximized offensive striking power. This evolution reflected a deeper understanding of combined arms, morale, and the geometry of killing on the medieval battlefield.

Unlike feudal levies, the Templars were a standing, professional army. Every brother knight was trained from his first day in the order to fight in formation, to obey orders instantly, and to trust his comrades. This discipline allowed them to execute complex tactical maneuvers that were beyond most contemporary forces. By examining their transition from the square to the line, we gain insight into how military thinking developed during the Crusades and how the Templars' legacy influenced European warfare for centuries.

The Genesis of the Square: Defense and Discipline

Origins of the Medieval Square

The square formation—often called a shield wall or Hedgehog when composed of infantry—was a natural defensive formation for armored knights and foot soldiers alike. In the early decades of the Crusader states, heavy cavalry was the dominant arm, but infantry and knights often fought dismounted to hold critical ground. The square was simple to form: men arrayed themselves in a compact block, with each rank facing outward. Spears, lances, or swords were pointed in all directions, presenting a wall of points to any attacker.

For the Templars, the square served as a mobile fortress. When caught in the open by a numerically superior enemy—especially by fast-moving Turkish horse archers—a square could withstand repeated ambushes. The horses of the knights were often placed inside the square, protected from arrows. This tactic is described in the Rule of the Temple, which instructed brothers to form a close formation when threatened. The earliest recorded use of a Templar square in battle occurred during the siege of Ascalon in 1153, where a small detachment of Templars formed a square to hold a breach against a larger force. The formation allowed them to survive long enough for reinforcements to arrive.

Square in Action: The Battle of Cresson (1187)

The dangers of a square formation are vividly illustrated by the Battle of Cresson, fought on May 1, 1187. A Templar force of about 140 knights, led by the Grand Master Gerard de Ridefort, was ambushed by a much larger Ayyubid army under Saladin. According to the chronicler Ernoul, the Templars formed a square and fought desperately. However, the square was too small and too static; the enemy archers poured arrows into the ranks while cavalry charges broke apart the formation. The square eventually collapsed, and most knights were killed. Only Gerard and a handful of survivors escaped. This disaster demonstrated that a static square, without supporting infantry or archers, was vulnerable to coordinated attacks from multiple directions. The lesson was not lost on the Templar leadership.

The Shift to the Line: Offensive Power and Flexibility

Influences from Byzantine and Muslim Tactics

By the late 12th century, the Templars had studied their opponents. Both the Byzantine Empire (before 1204) and the Muslim armies of the Ayyubids and Mamluks employed extended linear formations. The line formation allowed commanders to bring more troops to bear simultaneously. For knights, a line meant that each rider could charge with full momentum, striking the enemy front at the same time. The line also facilitated coordinated volleys from crossbowmen placed in front or between cavalry squadrons.

The Templars adopted the line formation as their primary offensive tactic during the Third Crusade. King Richard I of England, who fought alongside the Templars at Arsuf in 1191, organized his army in a dense marching line designed to withstand Turkish harassment while maintaining offensive capability. The Templars formed the vanguard of this column. Richard's tactics—protecting infantry with cavalry on the flanks and using disciplined counter-charges—were refined in conjunction with Templar commanders. The line formation at Arsuf allowed the Crusaders to march from Acre to Jaffa in good order, repelling constant attacks without breaking ranks.

How the Line Worked: The Formation Mechanics

A Templar line was typically two to four ranks deep. The front rank consisted of knights in full armor on the largest horses, armed with lances and swords. Behind them were more knights, and sometimes sergeants or turcopoles (light cavalry). Infantry archers or crossbowmen were often placed in front or on the flanks to disrupt enemy formations before the charge. The line could advance at a walk, trot, or gallop, depending on the distance to the enemy. Once within range, the knights lowered their lances and charged. The key advantage was that the entire line struck simultaneously, delivering a concentrated shock that could break enemy morale.

One of the best contemporary descriptions of a Templar line charge comes from the Itinerarium Peregrinorum et Regis Ricardi, which describes battles where the Templars advanced in a tight formation, banners flying, with no gaps. The line could also be extended or contracted quickly, allowing the commander to respond to flank attacks. By contrast, a square could not easily change shape without opening dangerous gaps.

Comparative Analysis: Square vs. Line in Medieval Context

When the Square Was Superior

The square formation remained useful in specific situations. During sieges, when defending a breach or a narrow passage, a square of dismounted knights could hold a point against overwhelming numbers. The Temple Mount in Jerusalem itself was defended in 1187 by a desperate square of Templars and Hospitallers, who sold their lives dearly. Also, when retreating from a lost field, a square could cover the withdrawal, especially if supported by archers. The square gave every soldier a clear fighting front and prevented enemy cavalry from riding through the formation.

Templar training emphasized the ability to form a square instantly from a column or line. This maneuver required precise drill—something that secular armies often lacked. In 1218, during the siege of Damietta, a Templar square held off a determined sortie by Egyptian troops, allowing the Crusader army to regroup. The square's main strength was psychological: it made every man feel supported on all sides.

When the Line Dominated

On the open battlefield, the line was superior for offensive operations. The Battle of Arsuf (1191) is a textbook example. The Crusader army marched in a hollow-square formation (a combination of line and column), but the actual combat was resolved by line charges. When the Muslim attacks became too intense, Richard ordered his knights to charge in a long line, breaking the enemy's front. The Templars, as the vanguard, executed this charge flawlessly. Their disciplined line struck the center of Saladin's army, causing a rout. After the charge, the line could be quickly reformed because each knight knew his position relative to his banner.

The line also allowed better use of combined arms. Infantry could protect the flanks, and crossbowmen could provide overhead fire. In the square, archers were often inside and had limited fields of fire. By the late 13th century, the line formation had become standard for Templar forces in pitched battles. The Battle of La Forbie (1244) showed the danger of a square: the Christian army used a large square formation but was overwhelmed by Mamluk light cavalry and archers. After that disaster, the Templars rarely used squares for open-field combat.

Tactical Flexibility: Switching Between Formations

Drill and Communication

The Templars were trained to transition between square and line rapidly. The Marshal of the Temple was responsible for battlefield tactics. He carried a standard called the Beau Séant, a black-and-white banner that served as a focal point. Visual signals and horn blasts indicated changes in formation. The Rule of the Temple details that no knight could break ranks except by command. This discipline made it possible to switch from a marching column to a line for an attack, then back to a square if threatened on the flanks.

A common maneuver in the 13th century was the wedge formation, a variant of the line where the front ranks were narrowed to a point, like an arrowhead. The wedge allowed knights to drive into enemy lines and then expand to a line once inside. The Templars used the wedge against dense infantry formations, such as those of the Egyptian Mamluks. The wedge combined the shock of the line with some protection against encirclement, though it required extremely well-trained cavalry.

Battlefield Examples: From Square to Line Mid-Fight

At the Battle of Arsuf, Richard's army initially marched in a square-like formation—the hollow square—but used line charges as the primary offensive weapon. At the Battle of Jaffa (1192), Richard used a thin line of dismounted knights and crossbowmen to defend the city against Saladin's assault, a classic example of the line's defensive potential. The Templars learned from these campaigns and incorporated line tactics into their own doctrine.

In 1266, the Templar castle of Safed was besieged by the Mamluks. The relieving force tried to form a square to fight through the besiegers but was cut down. After that, the order emphasized that line formations were safer for relief columns operating in open terrain. The last major field battle involving the Templars, the Battle of Wadi al-Khaznadar (1299), saw them deploy in a line alongside Mongol allies. Although the Crusader-Mongol alliance lost the battle, the Templar line held for several hours before being outflanked.

Legacy of Templar Formations

Influence on Western European Armies

The Templar experience influenced military thinking across Europe. The order's rule books were studied by later knights and commanders. The principle of a disciplined line charge, as perfected by the Templars, became the basis for heavy cavalry tactics in the Hundred Years' War. The English longbowmen and dismounted knights of Crecy and Agincourt used defensive squares (called 'herissons') to counter French cavalry, borrowing from Templar defensive tactics. Conversely, the French focused on linear charges, which the Templars had championed.

By the 14th century, the Templars were gone, but their tactical innovations persisted. The Swiss pike squares and the Spanish tercios of the 16th century owe a conceptual debt to the medieval square. The line formation would later evolve into the linear tactics of the 18th century, with volley fire replacing the lance charge. In many ways, the Templars were pioneers of disciplined combined-arms warfare.

Modern Military Echoes

Today, the concept of a 'formation' is central to military drill. The ability to transition from a line to a square (or to a diamond) is still taught in some cavalry units for ceremonial purposes. More practically, the Templar emphasis on unit cohesion and the psychological impact of a solid front is echoed in modern infantry tactics. The Soviet 'human wave' and the Western 'fire and movement' both derive from the same fundamental principle: that men fighting in a well-organized formation are far more effective than a disorganized mob.

Conclusion

The shift from square to line in Templar warfare was not a simple evolution but a tactical adaptation that reflected the order's learning from both victory and defeat. The square served as a crucial defensive tool in the early Crusades, saving lives and holding ground against superior numbers. The line gave the Templars the offensive power to break enemy armies and coordinate with other arms. Their ability to switch between the two formations made them one of the most feared military organizations of the medieval period.

Understanding this tactical evolution deepens our appreciation of how the Knights Templar fought. They were not just religious warriors; they were professional soldiers who studied the art of war, tested their theories in blood, and passed their knowledge down to their successors. Their legacy lives not only in legend but in the very structure of modern military formations.

For further reading, see Encyclopedia Britannica's entry on the Knights Templar and History Today's analysis of the Battle of Arsuf. The primary source De Re Militari offers translations of medieval chronicles that describe Templar tactics in detail.