Which preposition to use with mississippians

at Occurrences 3%

Hopes of the Mississippians at the Beginning of the War.

along Occurrences 1%

Although determined not to make a serious effort to prevent the enemy from crossing, General Lee had placed two regiments of Barksdale's Mississippians along the bank of the river, in the city, to act as sharp-shooters, and impede the construction of the pontoon bridges, with the view, doubtless, of thus giving time to marshal his troops.

Which preposition to use with  mississippians