of prisoners and non-combatants. While prisoners were usually ransomed for money or other prisoners, they were sometimes slaughtered out of hand - as at the battle of Dungans Hill in 1647. One of the reasons for warfare's increased impact was its indecisiveness. Armies were slow moving in an era before good roads and canals. Battles were relatively rare as armies could manoeuvre for months, with no direct conflict. In addition, battles were often made irrelevant by the proliferation of advanced, bastioned fortifications. To control an area, armies had to take fortified towns, regardless of whether they defeated their enemies' field armies. As a result, by far the most common battles of the era were sieges, hugely time-consuming and expensive affairs. Storming a fortified city could result in massive casualties and cities which did not surrender before an assault were usually brutally sacked -for example Magdeburg in 1631 or Drogheda in 1649. In addition, both garrisons and besiegers often suffered heavily from disease. The indecisive nature of conflict meant wars were long and endemic. Conflicts stretched on for decades and many states spent more years at war than they did at peace. The Spanish attempt to reconquer the Netherlands after the Dutch Revolt became bogged down in endless siege warfare. The expense caused the Spanish monarchy to declare bankruptcy several times, beginning in 1577. The changes in warfare eventually made the mercenary forces of the Renaissance and Middle Ages obsolete. However this was a gradual change. As late as the Thirty Years' War (1618–1648), most troops were mercenaries. However, after this conflict, most states invested in better disciplined and more ideologically inspired troops. For a time mercenaries became important as trainers and administrators, but soon these tasks were also taken by the state. The massive size of these armies required a large supporting force of administrators. The newly centralized states were forced to set up vast organized bureaucracies to manage these armies, which some historians argue is the basis of the modern bureaucratic state. The combination of increased taxes and increased centralisation of government functions caused a series of revolts across Europe such as the English Civil War and the Fronde in France. In many countries, the resolution of this conflict was the rise of monarchical absolutism. Only in England and the Netherlands did representative government evolve as an alternative. From the late 17th century, states started financing wars through long