The Landsknechte (singular: Landsknecht, ˈlantsknɛçt), also rendered as Landsknechts or Lansquenets, were Germanic mercenaries used in pike and shot formations during the early modern period. Consisting predominantly of pikemen and supporting foot soldiers, their front line was formed by Doppelsöldner ("double-pay men") renowned for their use of Zweihänder and arquebus. Originally organized by Emperor Maximilian I and Georg von Frundsberg, they formed the bulk of the Holy Roman Empire's Imperial Army from the late 1400s to the early 1600s, fighting in the Habsburg-Valois wars, the Habsburg-Ottoman wars, and the European wars of religion.
Although prone to mutiny if unpaid and divided within their ranks between Catholics and Lutherans, the Landsknechte were well-armed and experienced warriors. In addition, they were recruitable in large numbers throughout Germany and Austria by the Holy Roman Emperor and thus guaranteed both quantity and quality to the Imperial military for a century and a half. At their peak during the reign of Charles V of Habsburg, and under the leadership of notable captains such as Georg von Frundsberg and Nicholas of Salm, the Imperial Landsknechts obtained important successes such as the capture of the French King Francis I at the Battle of Pavia in 1525 and the resistance against the Ottoman Turks led by Suleiman the Magnificent at the Siege of Vienna in 1529, while also being responsible for the infamous Sack of Rome in 1527.
The Germanic compound Landsknecht (earlier Lantknecht, without Fugen-"s") combines Land and Knecht to form "servant of the land." The compound Lantknecht was used during the 15th century for bailiffs or court ushers.
The word Landsknecht first appeared in the German language circa 1470 to describe certain troops in the army of Charles, Duke of Burgundy. As early as 1500, the term was morphed into Lanzknecht, referring to the unit's use of the pike as its main weapon.
Over the Burgundian Wars, the well-organized and supplied armies of Charles the Bold were defeated again and again by the Swiss Confederation, which wielded an ad hoc militia army.