Battle of Breitenfeld (1631)

Fought on 17 September 1631 near the village of Breitenfeld, just north of Leipzig in Saxony, this battle gave the Protestant side its first great victory of the Thirty Years' War. A Swedish army under King Gustavus Adolphus, joined by the Saxons, shattered the Imperial and Catholic League army of Count Tilly. The result secured Sweden's place in the war and showed the power of the king's new, more flexible tactics.

Gustavus Adolphus landed in Pomerania in June 1630 with nearly 18,000 men. At first few German princes joined him, wary of inviting a foreign power into the Holy Roman Empire. The sack of Magdeburg by Imperial troops in May 1631 served as a stark warning of what an Imperial victory might mean, and French subsidies under the Treaty of Bärwalde helped Gustavus enlarge his army. His alliance with the Elector John George I of Saxony prompted Tilly to invade Saxony, and the combined Swedish-Saxon army advanced on Leipzig, Tilly's base.

According to one modern reckoning, the allies fielded about 40,000 men, some 22,800 Swedes and 17,350 Saxons, with 66 guns, against around 31,400 Imperial and League troops with 27 guns. Tilly drew up his army in large, deep infantry blocks called tercios on rising ground, the Galgenberg. The Swedish infantry stood in smaller, shallower brigades that mixed pikemen with musketeers trained to fire in volleys, supported by light regimental guns, with musketeers posted among the cavalry.

The battle opened around midday with a cannonade of about two hours, in which the Swedish guns fired much faster than the Imperial ones. Around two o'clock Gottfried zu Pappenheim, without orders, led his cuirassiers against the Swedish right. Close-range musket volleys and countercharges repulsed attack after attack, and a Swedish cavalry charge under Johan Banér finally drove his horsemen off. On the other wing, however, the Imperial cavalry and then Tilly's infantry fell on the Saxons, who broke and fled, carrying their elector with them. Within about an hour almost the whole Saxon army had left the field, and the allies had lost a third of their strength.

Tilly now wheeled his tercios to roll up the exposed Swedish left. Field Marshal Gustav Horn swiftly turned his wing to face the new threat, and the king sent the brigades of his second line, including Scottish troops under John Hepburn, to support him. Their volleys and close-range artillery fire stalled the slow-moving tercios. Gustavus then led cavalry against the Imperial left, seized Tilly's guns on the Galgenberg and turned them on his infantry. Caught in a crossfire of artillery, Tilly's army collapsed in the early evening. Tilly himself was wounded, and Pappenheim covered the retreat of the remnants towards Halle.

Estimates put Imperial and League losses at around 7,000 to 8,000 killed and wounded and some 6,000 captured, many of whom were then recruited into the Swedish army; thousands more were lost during the flight. Tilly also lost all his artillery and around 120 standards. The Swedes lost about 3,550 men, the Saxons between 2,000 and 3,000.

The victory caused a sensation across Europe and was celebrated by Lutherans as revenge for Magdeburg. Instead of marching straight on Vienna, Gustavus turned west and south, taking Erfurt, Würzburg and Frankfurt am Main and wintering in Mainz, while the Saxons advanced towards the Habsburg hereditary lands. More German states joined the Swedish side and France increased its subsidies. Although Gustavus was killed at Lützen the following year, Sweden remained a major force in the war until the Peace of Westphalia in 1648, and his combination of firepower and mobility was widely copied.

Our 1650 map shows the Holy Roman Empire at the end of the war, with the battlefield in today's Germany.