Which preposition to use with herzegovinians

in Occurrences 1%

The houses are built in small blocks, as a protection against earthquakesthe terror of every Ragusan (only mention the word and he will cross himself)and here on a fine Sunday morning you may see Dalmatians, Albanians, and Herzegovinians in their gaudiest finery, while here and there a wild-eyed Montenegrin, armed to the teeth, surveys the gay scene with a scowl, of shyness rather than ill-humor.

out Occurrences 1%

Socica remained in supreme command in the mountainous Piva district, now buried under the snow, and Peko took the direction in the lower country, and established himself at the old camp at Grebci, driving Ljubibratich and his Herzegovinians out of the field.

Which preposition to use with  herzegovinians