In the idiom of the day, they were sutlers, although today they'd probably be called vendors.

'Manny? Sweet? Manny doesn't do sweet.' 'Every man does sweet, Max. Even weird ones with payess.'

But, on the whole non-lexical features are all that is needed to accurately determine the language being spoken when collecting data.

Within the furthest end thereof there was a pleasant Bowre So vaulted with the leauie trées the Sunne had there no powre: