[3] When the snow reaches certain levels the road and railway line are closed and a diversion is used via Seefeld and the narrow valley of the Leutascher Ache to Mittenwald.

The Tyrolese achieved a partial success when, on 20 October 1500, Emperor Maximilian I and Prince-Bishop Philip of Freising ratified a treaty agreed the year before that moved the border of Tyrol to within a kilometre south of Scharnitz.

[8] In 1633 Tyrol was granted the right to build a castle, Porta Claudia, at the Scharnitz Pass on Werdenfels territory in order to protect themselves from the advancing Swedish Army in the Thirty Years' War.

By a treaty of 29 October 1656, Scharnitz and the region around the Porta Claudia were swapped for a strip of land around the Kienleithenkopf including the Karolingerhof and rights of way into the Hinterautal valley.

With another treaty on 28 May 1766, Tyrol's possession of Scharnitz and the Porta Claudia was confirmed as was a strip of territory "at a musket shot's distance at all existing fortification works in the direction of Mittenwald“.