In 1632, the Swedish army attacked, and the following year the entire force entered the city. The castle remained in the hands of the Hohenzollerns, and the troops marched on to Sigmaringen, which fell into the hands of Eberhard III, Duke of Württemberg (1614–1674) in 1633. Finally, on 5 July 1633, the city yielded to the Württembergs, and the castle was besieged. The siege lasted nine months, the castle receiving food from the local farmers through underground passages and bartering for it with precious objects from the castle.