Alas, it's more than a challenge. New England states tended to do this and, when the state governments took over maintaining Vitals, some municipalities happily sent copies to the state while others sent only some records and still others sent nothing. This means that it is hard to know
if the record is available, let alone try to depend on the internet. Small towns in Connecticut were notorious for records being kept in the attics of former officials.
However, the Massachusetts records are really good.
Fortunately, New England is a lovely place to visit (if you avoid winter)! Places like Burlington are worth seeing--even without the impetus of research
and these soldiers have chosen well!