Which preposition to use with helvetians

in Occurrences 1%

It had formerly several other names and was famous for its capital, Thebes; it is now called Stramulipa Boii, an ancient people of Germany who, passing the Rhine, settled in Gaul, the Bourbonnois; they join with the Helvetians in their expedition against Gaul, G. i. 5; attack the Romans in flank, ibid.

to Occurrences 1%

Caesar knew as well how to gain time as not to lose any: he was not ready; so he put off the Helvetians to a second conference.

towards Occurrences 1%

The name appears to be derived from the Celtic, jou-rag, which signifies the "domain of God;" the boundary of the Helvetians towards the Sequani, G. i. 2 Labi[=e]nus, one of Caesar's lieutenants, is attacked in his camp, G. v. 58, vi. 6; his stratagem, G. vii.

Which preposition to use with  helvetians