Gustavus Adolphus and the Military Revolution Debate

Introduction: The Question of Military Revolution

History has played host to many great military commanders and generals—brilliant men who have steered the course of history through a combination of brilliant tactics, innovations, and sheer boldness. In his memoirs written during his exile on St. Helena, Napoleon Bonaparte is alleged to have written that "seven great captains have come before me." These great captains, in chronological order, were Alexander the Great, Hannibal Barca, Julius Caesar, Gustavus Adolphus, Viscount Turenne, Prince Eugene, and Frederick the Great. However, notice that in this list Gustavus Adolphus is the first great captain of what historians would recognize as being of "the modern era," and that the sixteen centuries separating Julius Caesar and Gustavus Adolphus are barren of notable talent. In the eyes of some historians, this is why the centuries of slow evolutionary change have been forgotten, and why Gustavus Adolphus is debated to have caused a "military revolution." This article shall therefore address these two points and either prove or disprove them. Was Gustavus Adolphus II of Sweden truly the "Father of Modern Warfare," as he is affectionately known, and did he really usher in the "Military Revolution"?

Gustavus Adolphus and Sweden

In order to answer these two questions, one must first establish the identity of the titular figure himself and, by extension, establish the context of this debate. Gustav II Adolf, better known by his Latinized name Gustavus Adolphus, ruled as the King of Sweden between 1611 and 1632. He is credited with elevating Sweden to a position of immense political, military, and religious stature through his involvement in the Thirty Years War. Gustavus is the only Swedish monarch to have been granted the title of "Magnus," meaning "Great," posthumously making his full title Gustavus Adolphus Magnus. The granting of this prestigious title is not without merit, as Gustavus was famous for not only being a masterful military leader but also for being a champion of his people in Sweden and of the relatively fledgling Protestant church. He was very popular among both his nobility and his troops, as he was known to cross social worlds and envelop himself in all rings of his society while never losing sight of what his status as a monarch meant.

Gustavus and Sweden joined the Thirty Years War through a sequence of events, but suffice to say that Gustavus sought to expand the influence of Sweden through warfare and sought to protect Protestantism in Europe by preventing any potential Catholic aggression against his homeland. The majority of battles in the Middle Ages had been won almost exclusively by whomever could field the larger army and whoever could muster the greater number of cavalry. Indeed, this was the model that many of the belligerents of the Thirty Years War continued to use until Gustavus arrived in the Holy Roman Empire via the Duchy of Pomerania in 1630. This was not Gustavus's first foray into warfare, however, for he had fought against Poland between 1626 and 1629—a campaign during which he developed and refined innovations he brought to bear on the armies of the Habsburgs.

The Swedish Army's Tactical Innovations

The Swedish army stood apart from its contemporaries through five characteristics. Its soldiers wore uniform and had a nucleus of native Swedes, raised from a surprisingly diplomatic system of conscription, at its core. The Swedish regiments were small in comparison to their opponents and were lightly equipped for speed. Each regiment had its own light and mobile field artillery guns called "leathern guns" that were easy to handle and could be easily maneuvered to meet sudden changes on the battlefield. The muskets carried by these soldiers were of a type superior to that in general use and allowed for much faster rates of fire. Swedish cavalry, instead of galloping up to the enemy, discharging their pistols, and then turning around and galloping back to reload, ruthlessly charged with close-quarter weapons once their initial shot had been expended. By analyzing this paradigm, it becomes apparent that the army under Gustavus emphasized speed and maneuverability above all—this greatly set him apart from his opponents.

These innovations are perhaps best demonstrated by the manner in which Gustavus constructed his forces on the battlefield. Swedish regiments resembled the typical Spanish tercio formations used by the majority of the Catholic armies, albeit with slight modifications. The regiments consisted of a central pike block flanked by musketeers, but what set them apart from their contemporaries is that the formations were shallower than the Dutch system, with ranks six men deep rather than ten. This formation, called "swinesfeather," presented a broader but thinner front which brought more firepower to bear on enemy formations. Swedish musketeers were drilled to maintain continuous fire by use of the "counter-march," in which shot-starved musketeers would retreat behind musketeers ready to fire so as not to interrupt the barrage of fire and not to present a sitting target to the enemy.

Gustavus also added the tactic of "doubling the files" when the enemy drew near, in which the rearmost ranks of musketeers moved up to fill the gaps between the frontline ranks, thereby transforming a six-rank formation into three ranks and doubling the spread of fire, greatly increasing the amount of firepower in a pinch. During this maneuver, the front rank would kneel, the second rank would crouch, and the third rank would stand. When commanded, all three ranks would fire simultaneously to deliver an utterly devastating salvo. If the enemy somehow withstood this hail of lead, the Swedish musketeers would reload behind the protection of the pikemen before they could fire again. If their enemies faltered in the face of such overwhelming firepower, the Swedish soldiers and cavalry would draw close-quarter weapons and charge the shattered enemy line, all the while supported by their regimental artillery that could be moved forward with ease to support the advancing Swedes.

The Battle of Breitenfeld and Its Significance

The Battle of Breitenfeld in 1631 was the first time that the reformed Swedish army and these innovative tactics were employed to devastating effect. Despite their Saxon allies being routed by the Habsburg cavalry, the Battle of Breitenfeld was a massive victory for the Swedish. The battle must take its place in the simplified tradition customarily called history, not because of what it achieved but because of what contemporary men thought it had achieved. It was as though Gustavus, through this decisive victory in such a "revolutionary" manner, had made a bold statement that the Habsburg dynasty—that long-standing bastion of Catholicism—had been defeated and its latest crusade against Protestantism had been utterly crushed. Breitenfeld is the event which bore Gustavus's name into the hearts and minds of his contemporaries and would later write his name into the books of European history.

Two hundred years later, in the relatively liberal nineteenth century, a monument was erected on the battlefield near Leipzig, bearing the phrase: "Glaubensfreiheit für die Welt, rettete bei Breitenfeld—Gustav Adolf, Christ und Held. Am 7. September 1631." This roughly translates to: "Freedom of Belief for the World, salvaged at Breitenfeld, Gustav Adolf, Christian and Hero. 7 September 1631." The similarities between the Spanish, Dutch, and Swedish armies are no mere coincidence, as it has been argued that many of the innovations Gustavus heralded were either not his own creations or were acts of miraculous accident. Gustavus perfected lessons from his counterparts as much as he innovated. Some historians have argued that the innovations of the Swedish army during the Thirty Years War came about as a result of a lack of resources, problems that Gustavus managed to turn into advantages. That is to suggest that the reduction in the size of regiments was due to a shortage of soldiers, that the lightening of cavalry armor was a result of a lack of sturdier armor, and that the cavalry reliance on swords over pistols was made necessary by a lack of pistols. However, if this argument holds true, and considering the contemporary logistics of waging wars on foreign soil it might well do so, then it does not detract from the legacy of Gustavus Adolphus and only serves to reiterate his brilliance as a military leader for turning deficiencies into victories.

Scholarly Debate: The Military Revolution Theory

Although some of the innovations Gustavus is attributed with are dubious at best, his status as a brilliant commander, an influential and adored statesman, a man of great integrity, and one of the greatest European monarchs in history are not open to debate. Gustavus Adolphus is revered as a national hero in Sweden, and his actions are likewise revered worldwide and across history. His sudden and decisive victories against the Habsburgs and the Holy Roman Empire by utilizing arts of warfare hitherto unsuspected are why the centuries of slow evolutionary change that preceded him have largely been forgotten or neglected by historians. This is why Gustavus is said to have caused a "military revolution"; this is why he is credited with so many innovations. As Napoleon unwittingly suggested, Gustavus Adolphus was simply the first identifiable great commander of the modern age, and this is why he is referred to as "The Father of Modern Warfare." It is a grandiose title, but if one chooses to engage the past on its own terms and considers contemporary elements, it is a valid title to bestow.

This brings us to the second question this article set out to address: Was there a "military revolution"? Ever since the term was first coined by Professor Michael Roberts in 1955 during a lecture, it has been contested between historians. Roberts's thesis places what he calls "the military revolution" between 1560 and 1660 and breaks it down into four distinct areas of revolutionary change: tactics, strategy, increased scale of warfare, and the increased impact of war on societies. At first glance, it appears that Roberts's thesis, especially in the case of the Thirty Years War and Gustavus Adolphus, is resoundingly accurate, as it not only fits the time scale but also fulfills all four tenets of the theory. Roberts's thesis has since won over many historians such as Geoffrey Parker and Peter Paret, who have respectively gone on to either expand the theory or merely acknowledge it.

Geoffrey Parker went on to expand the timeframe of the military revolution by a good two hundred years, and this has understandably drawn fire from historians who were either dubiously curious about the original theory or who outright denied it. Among these historians is a scholar who has written extensively on military history, writing around ninety books in total. His criticism of the military revolution theory is multifaceted. First, how could a revolution take three centuries to reach fruition? Second, was the process of military evolution more of a slower evolutionary process rather than a sudden revolutionary one? Third, this scholar stoutly believes that the theory is far too "Eurocentric" and fails to take into account innovations and key events beyond the western world. Fourth and finally, would not changes in warfare have naturally progressed as military technology improved and populations expanded, much like the way subsistence farming was broken in England during the agricultural revolution? This is not to suggest that this scholar is entirely hostile to the concept of the military revolution; rather, he dislikes the term because it is too simplistic and its timeframe is wrong.

Geoffrey Parker presents an amicable defense to the first of these criticisms by drawing a comparison to the agricultural and scientific revolutions, stating: "Not all revolutions in history are alike. In the political sphere, one expects a 'sharp, sudden change or attempted change in the area of political power.' Dramatic changes in other spheres, however, take far longer and present more complexity because they affect, almost by definition, more than one country." Parker's use of the scientific revolution as support, on the other hand, is probably not the best idea, as that term remains under historical scrutiny for similar reasons. Parker's defense also fails to fully address the issue of Eurocentrism, as, despite acknowledging that changes came to "more than one country," the countries affiliated with the military revolution are still exclusively European. However, one can argue that the process of the evolution of warfare in the Early Modern World would ultimately come to revolutionize the world as its contemporaries knew it. The grand victories of Gustavus Adolphus using quasi-revolutionary tactics and strategies amplified the contemporary reaction to his battles and therefore give one the impression that his actions during the Thirty Years War were revolutionary when, in reality, they were not.

Conclusion: Evolution, Not Revolution

The problem, therefore, lies in the definition of this process. There certainly were changes in warfare between the seventeenth and early nineteenth centuries, but they were hardly a "revolutionary" change as we know it. The term "revolution" is too grandiose for an evolutionary process that took centuries to conclude. A more suitable title for the theory of the "Military Revolution" would be "The European Military Evolution." This refined terminology acknowledges the genuine innovations of figures like Gustavus Adolphus while avoiding the misleading implication of sudden, dramatic transformation. The evidence suggests that while Gustavus was undoubtedly a military genius whose tactical brilliance impressed his contemporaries and changed the immediate course of European warfare, the broader transformation of Early Modern military practice was a gradual process of refinement, adaptation, and technological development rather than a revolutionary rupture with the past.