The rebels had now a firm foothold both in Holland and Zeeland, and their numbers grew rapidly from day to day.
Soon the whole of the island of Walcheren, on which Flushing stands, was in their hands with the exception of the capital Middelburg; and in Holland several important towns hoisted the flag of revolt and acknowledged the Prince of Orange as their lawful Stadholder.

From Holland the rebellion spread into Friesland.

Finally on June 19 an assembly of the Estates of Holland was, at the instance of Dordrecht, convened to meet in that town.

There was but one representative of the nobility present at this meeting, whose legality was more than doubtful, but it included deputies of no less than twelve out of the fourteen towns which were members of the Estates.

The prince sent Ste Aldegonde as his plenipotentiary.