Photos of mechanical peat cutting on the Walchwilerberg at Eigenried, adjacent to Früebüel for energy supply during both world wars. Taken in 1918; website of the Building Department of Zug). Peat cutting for humus improvement in gardens continued until 1960.

Aerial views from 2011 overlapping the general location plan from 1918 show the structure which was formed by the drainage trenches created for peat cutting (photos from the website of the Building Department of Zug). Due to the drying-up birch trees grew along the trenches.

On the left is the barn with horses in front of the horse stables and on the right the administration building which was completed in 1945. Both still exist today. Photos from the calendar of Zug in 1944 from the report "How the Zugerberg obtained a new face" by Heinrich Bütler.

Cultivation plan of Früebüel from 1949, added to the land acquisition plan from 30.04.1943 / 15.06.1944 with an addition from 14.06.1947. At this time the land was used for intensive animal feed production (pasture, clover-grass, corn, oats), winter and summer crops, potatoes and arable farming to ensure enough nutrition was available. Map from government archives with a Google Earth image.

Left: GIS map of the Zug-Map with barns in the north and four residential houses in the south. In the lower part the fences are visible where the baracks of the military prison stood. Right: Map from 1989 with the baracks and barbed wire below the administration building. The latter is still in use. The baracks were demolished in 1998 and the fence removed in 2010.