The new castle allowed the Ramosch family to control trade and taxes throughout the Lower Engadine.

As a sign of appreciation for his service in an Austrian war in Italy, the Duke appointed Ulrich of Matsch as the owner of Tschanüff.

However, in the following year, Matsch attacked and plundered the castle but retreated when the Bishop led an army toward Ramosch.

In 1421 a peace treaty gave the castle to the Bishop and the Lords of Matsch were paid 2500 marks for their losses.

During the Swabian War of 1499, the Bishop's own troops burned the castle to prevent it from falling into the Emperor's hands.

The Lower Engadine residents were found liable for the damage and ordered to pay to rebuild the castle.

Numerous masonry joints and differences in the wall structure indicate that the building must have taken place in several stages.

There are holes for wooden beams at a height of four floors and towards the south the remains of an unusually thick wall.

West of the main tower was a two-storey building dating from around 1500, Erwin Poeschel believed it to have been a kitchen or smithy, on the upper floor living quarters.

Window openings in the western wall of the enclosure point to an original continuation to the west; However, these parts of the building collapsed during landslides.