The quick fall of Maastricht meant that Louis had some time to spare. To keep the king occupied he attacked the Electorate of Trier, without a declaration of war, on the pretext the bishop had allowed the entry of some companies of imperial troops. The city of Trier was besieged and largely destroyed. William III had feared that 's-Hertogenbosch or Breda would be the next French target and had assembled an allied States-Spanish army of thirty thousand at Geertruidenberg to relieve any of these cities. The French had indeed considered an attack on 's-Hertogenbosch but decided against it because success could not be guaranteed in view of the marshy terrain. Although losing Maastricht was a blow to Dutch morale, the Trier siege it gave cause to would be very favourable to them. Public opinion in the German states was outraged by the French conduct. The emperor moved his army into the Rhineland and Louis in response withdrew most of his troops from the Holland Water Line, dangerously weakening his hold on Utrecht and Gelderland.