There are two danger areas in the Surselva, shown on the header image above, which could be relevant if you are trying to fly from Fiesch to Chur.
LS-D10 is a cylinder 20km in diameter, centred near Brigels, and only occasionally activated. The Daily Airspace Bulletin for Switzerland for 22nd June 2016 showed that it was active from ground level to 2250m ASL, between 8.30-11.30 and 13.30-16.30 local time (0630 – 0930 and 1130 – 1430 UTC). In practice, this did not present a substantial problem, as one would expect to be higher than 2250m when flying through this area. However, a landing between Trun and Ilanz before 16.30 would have been within this airspace whilst it was active.
LS-D15 is much smaller, around 1km x 2km in size, located on the western edge of Chur, and seems to be activated more frequently. I believe it is used as a military firing range. It extends from ground level up to 6000ft/1850m ASL (around 1300m AGL) so would be important if you were landing in this area. However, as I explain in the Surselva page, there is usually such a strong valley breeze in Chur that you should not plan to land here in the first place.
The Daily Airspace Bulletin for Switzerland for 10th July 2017 showed that it was active on that day between 08.00 – 12.00 and 13.00 – 17.00 (0600 – 1000 and 1100 – 1500 UTC), so could easily have been reached from Fiesch early enough to be relevant.
So it’s a good idea to check the DABS every day!