Changes in European military tactics and weaponry in the military revolution caused the Sipahi cavalry to lose military relevance. The Long War against Austria (1593–1606) created the need for greater numbers of infantry equipped with firearms. This resulted in a relaxation of recruitment policy and a significant growth in Janissary corps numbers. Irregular sharpshooters (Sekban) were also recruited for the same reasons and on demobilization turned to brigandage in the Jelali revolts (1595–1610), which engendered widespread anarchy in Anatolia in the late 16th and early 17th centuries. With the Empire's population reaching 30,000,000 people by 1600, shortage of land placed further pressure on the government.