Which preposition to use with unterwalden

with Occurrences 1%

Thereupon the Emperor waxed wroth; the ban was laid upon them by Hermann, Bishop of Constance; but they withdrew, nevertheless, from the protection of the Empire, and Uri and Unterwalden with them,fearing neither the Emperor nor the ban, for they could not conceive how it was a sin to maintain the right, and so they pastured their cattle without fear.

Which preposition to use with  unterwalden