quo v. qua as "where" words

How would you call this conjunctive in vadamus… Deliberative? I guess so

Inasmuch as Russian is already used in this topic, I would add explanation in Spanish taken from “El latin enseñado como lengua viva” (Hernandez, 1916). Particulary, lessons XXXVII (declensions) and LVI (adverbs of place):

  • quo - a donde, ¿what is the final destination?
    answer: in/ad + ACC
  • qua - por donde ¿whereby? ¿by which way?
    answer: per + ACC

If you can read French see also Ernout Thomas Syntaxe latine on the contamination of meanings of ubi and quo.