One of the first cares of the council-pensionary after the peace with England was to deal with the internal troubles which were disturbing certain parts of the land, notably Groningen, Zeeland and Overyssel. In the last-named province a serious party struggle arose out of the appointment of a strong Orangist, named Haersolte, to the post of Drost or governor of Twente. The Estates were split up, the Orange partisans meeting at Zwolle, the anti-Orange at Deventer. Both enlisted troops, but those of Zwolle were the stronger and laid siege to Deventer. The victorious Orangists then nominated William III as stadholder with William Frederick as his lieutenant. At last, after three years’ strife, the parties called in De Witt and William Frederick as mediators. But De Witt was far too clever for the Friesland stadholder. It happened that the post of field-marshal had just fallen vacant by the death of Brederode. Both William Frederick and his cousin Joan Maurice aspired to the office. The council-pensionary induced his co-mediator, with the hope of becoming Brederode’s successor, to yield on all points. Haersolte was deprived of office; the prince’s appointment as stadholder was suspended until his majority; and therefore William Frederick could not act as his lieutenant. Thus peace was restored to Overyssel, but William Frederick was not appointed field-marshal. In the other provinces the tact and skill of De Witt were equally successful in allaying discord. He would not have been so successful had the Orange party not been hopelessly divided and had it possessed capable leaders.