the Bishops of Münster and Cologne. The Dutch troops took revenge and carried out many atrocities. Together with 35,000 Imperial troops, they then captured Bonn, an important magazine in the long logistical lines between France and the Dutch Republic. The French position in the Netherlands became untenable and Louis was forced to evacuate French troops. This deeply shocked Louis and he retreated to Saint Germain where no one, except a few intimates, were allowed to disturb him. The next year only Grave and Maastricht remained in French hands. Fagel now proposed to treat the liberated provinces of Utrecht, Gelderland and Overijssel as conquered territory (Generality Lands), as punishment for their quick surrender to the enemy. William refused but obtained a special mandate from the States General to appoint all delegates in the States of these provinces anew. William's followers in the States of Utrecht on 26 April 1674 appointed him hereditary stadtholder. On 30 January 1675, the States of Gelderland offered him the titles of Duke of Guelders and Count of Zutphen. The negative reactions to this from Zeeland and the city of Amsterdam made William ultimately decide to decline these honours; he was instead appointed stadtholder of Gelderland and Overijssel. Spinoza's warning in his Political Treatise of 1677 of the need to organize the state so that the citizens maintain control over the sovereign was an influential expression of this unease with the concentration of power in one person. Meanwhile, the front of the war against France had shifted to the Spanish Netherlands. In 1674, Allied forces in the Netherlands were numerically superior to the French army under Condé, which was based along the Piéton river near Charleroi. William took the offensive and sought to bring on a battle by outflanking the French positions but the broken ground forced him to divide his army into three separate columns. At Seneffe, Condé led a cavalry attack against the Allied vanguard and by midday on 11 August had halted their advance. Against the advice of his subordinates, he then ordered a series of frontal assaults which led to very heavy casualties on both sides with no concrete result. William and the Dutch blamed the Imperial commander, de Souches, and after a failed attempt to capture Oudenaarde, largely due too obstructionism from de Souches, he was relieved of command. Frustrated, William joined the army under Rabenhaupt with 10,000 troops instead of campaigning