Thirty Years' War David Drummond (1593–1638), was a Scottish soldier who became a Swedish major-general, colonel and knight.

At the beginning of 1622 he was transferred to Johan Baner's newly formed field regiment, which was part of the army under Gustavus Adolphus which operated against Mitau.

Infectious diseases ravaged the garrison, and before the end of the year Drummond was back in Kalmar to reestablish his regiment's combat capability.

[1][2][3] The Polish War ended with the truce of Altmark in 1629, and Drummond's regiment, which he now commanded as colonel, was eventually sent back to Sweden.

When Gustavus Adolphus entered the Thirty Years' War in 1630, Drummond and his regiment remained in Kalmar, due to King's mistrust of Danish intentions.

In a letter to the King of June 2, Drummond expressed his desire to accompany the main army during the mobile operations, but this did not happen.

When Johan Banér became field marshal in 1634, Drummond was commissioned major general of foot in his army, and participated during the end of the year with distinction in his campaigns.

[1][3] During the troubling year of 1635, Drummond was for a time commander in Erfurt, where he had to suffer much from the attacks of the Saxons, and reported in Egeln personally to Banér about the actions of William, Duke of Saxe-Weimar.

Early in 1636, Drummond took part in Baner's and Herman Wrangel's defense of Pomerania against the Imperial Army of Matthias Gallas.