Gustavus Adolphus
Reputation

Historian Ronald S. Love wrote that in 1560–1660 there were "a few innovators, notably Maurice of Nassau and Gustavus Adolphus of Sweden, whom many scholars credit with revolutionary developments in warfare and with having laid the foundations of military practice for the next two centuries." Scholars consider him an extremely able military commander. His integration of infantry, cavalry, logistics, and particularly his use of artillery, earned him the title of the "Father of Modern Warfare".

Future commanders who studied and admired Gustavus Adolphus include Napoleon I of France and Carl von Clausewitz. His advancements in warfare helped make Sweden the dominant Baltic power for the next hundred years (see Swedish Empire). He is also the only Swedish monarch to be styled " the Great ". This decision was made by the Swedish Riksdag of the Estates in 1634, making him officially called Gustavus Adolphus the Great (Gustavus Adolphus Magnus).

Gustavus Adolphus was the main figure responsible for the success of Swedish arms during the Thirty Years' War and led his nation to great prestige. As a general, Gustavus Adolphus employed mobile artillery on the battlefield, as well as very aggressive tactics, where attack was stressed over defense, and mobility and cavalry initiative were emphasized.

Among other innovations, he installed an early form of combined arms in his formations, where the cavalry could attack from the safety of an infantry line reinforced by cannon, and retire again within to regroup after their foray. Inspired by the reform of Maurice of Nassau, he adopted much shallower infantry formations than were common in the pike and shot armies of the era, with formations typically fighting in 5 or 6 ranks, occasionally supported at some distance by another such formation—the gaps being the provinces of the artillery and cavalry as noted above.

His artillery were themselves different—in addition to the usual complements of heavy cannon, he introduced light mobile guns for the first time into the Renaissance battlefield. These were grouped in batteries supporting his more linearly deployed formations, replacing the cumbersome and unmaneuverable traditional deep squares (such as the Spanish tercios that were up to 50 ranks deep) used in other pike and shot armies of the day. In consequence, his forces could redeploy and reconfigure very rapidly, confounding his enemies. He created the modern Swedish Navy, which transported troops and supplies to the Continental battlefront.

Carl von Clausewitz and Napoleon Bonaparte considered him one of the greatest generals of all time, an evaluation agreed with by George S. Patton and others. He was also renowned for his constancy of purpose and the equality of his troops—no one part of his armies was considered better or received preferred treatment, as was common in other armies where the cavalry were the elite, followed by the artillery, and both disdained the lowly infantry. In Gustavus Adolphus's' army the units were extensively cross-trained. Both cavalry and infantry could service the artillery, as his heavy cavalry did when turning captured artillery on the opposing Catholic tercios at First Breitenfeld.

Pikemen could shoot—if not as accurately as those designated musketeers—so a valuable firearm could be kept in the firing line. His infantrymen and gunners were taught to ride, if needed. Napoleon thought highly of the achievement and copied the tactics. However, recent historians have challenged his reputation. B. H. Liddell Hart says it is an exaggeration to credit him with a uniquely disciplined conscript army, or call his the first military state to fight a protracted war on the continent. He argues that he improved existing techniques and used them brilliantly. Richard Brzezinski says his legendary status was based on inaccurate myths created by later historians. Many of his innovations were developed by his senior staff.
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