The revolt against Philip II's rule in the Low Countries, opened by the Duke of Alba's repression from 1567, was fought city by city, and the Spanish reconquest of the south between 1579 and 1585 emptied its Protestant communities. Sacks by unpaid Spanish troops set the pattern: Mechelen and Zutphen in 1572, Naarden the same year, the 'Spanish Fury' at Antwerp in November 1576, in which contemporaries claimed as many as 17,000 dead and a thousand buildings burned, and Maastricht in 1579. When Antwerp capitulated on 17 August 1585, Alexander Farnese allowed its Protestants four years to wind up their affairs and depart rather than expelling them outright, and the city lost some 60,000 of its 100,000 people. The northern provinces, England and the Rhineland absorbed the emigrants, and the transfer of Antwerp's merchants, printers and textile workers to Amsterdam, Leiden and Haarlem is treated in the standard economic histories as a foundation of the Dutch Golden Age. Casualty figures reported by sixteenth-century chroniclers for the sacks, particularly Antwerp 1576 and Maastricht 1579, are generally regarded as inflated.
Spanish Habsburg armies reconquered the southern Netherlands, expelling or driving out Protestant townspeople to the northern provinces and abroad
Hearth counts and urban registers put the seventeen provinces at roughly 3 million in the 1560s, with about 2 million in the ten southern provinces. The exodus was overwhelmingly urban: Antwerp fell from about 100,000 inhabitants in 1560 to roughly 42,000 by 1589, and Ghent, Bruges and Brussels lost comparable shares.
The range covers civilians killed in the major sacks of the revolt (Mechelen, Naarden and Zutphen in 1572, Antwerp in 1576, Maastricht in 1579). The upper end reflects contemporary chronicle and pamphlet claims, notably 17,000 at Antwerp, which circulated as propaganda; the lower end reflects modern scepticism about those numbers. Deaths from the sieges' hunger and disease are not included and were probably larger.
Massacre, arson and the plunder of churches during the sacks are described in contemporary chronicles and city records on both sides, which modern historians use while discounting their casualty arithmetic.
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