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In modern times

Modern conscription, the massed military enlistment of national citizens (levée en masse), was devised during the French Revolution, to enable the Republic to defend itself from the attacks of European monarchies. Deputy Jean-Baptiste Jourdan gave its name to the 5 September 1798 Act, whose first article stated: "Any Frenchman is a soldier and owes himself to the defense of the nation." It enabled the creation of the Grande Armée, what Napoleon Bonaparte called "the nation in arms", which overwhelmed European professional armies that often numbered only into the low tens of thousands. More than 2.6 million men were inducted into the French military in this way between the years 1800 and 1813.

The defeat of the Prussian Army in particular shocked the Prussian establishment, which had believed it was invincible after the victories of Frederick the Great. The Prussians were used to relying on superior organization and tactical factors such as order of battle to focus superior troops against inferior ones. Given approximately equivalent forces, as was generally the case with professional armies, these factors showed considerable importance. However, they became considerably less important when the Prussian armies faced Napoleon's forces that outnumbered their own in some cases by more than ten to one. Scharnhorst advocated adopting the levée en masse, the military conscription used by France. The Krümpersystem was the beginning of short-term compulsory service in Prussia, as opposed to the long-term conscription previously used.

In the Russian Empire, the military service time "owed" by serfs was 25 years at the beginning of the 19th century. In 1834 it was decreased to 20 years. The recruits were to be not younger than 17 and not older than 35. In 1874 Russia introduced universal conscription in the modern pattern, an innovation only made possible by the abolition of serfdom in 1861. New military law decreed that all male Russian subjects, when they reached the age of 20, were eligible to serve in the military for six years.

In the decades prior to World War I universal conscription along broadly Prussian lines became the norm for European armies, and those modeled on them. By 1914 the only substantial armies still completely dependent on voluntary enlistment were those of Britain and the United States. Some colonial powers such as France reserved their conscript armies for home service while maintaining professional units for overseas duties.