Which preposition to use with clarksville

on Occurrences 1%

Half of the militia of the district were to go; the men were to assemble, on foot or on horseback, as they pleased, at Clarksville on September 10th.

with Occurrences 1%

I came across the mountain to Clarksville with a Methodist preacher and his family and married here.

Which preposition to use with  clarksville