Mudcat wasn't attacked, but the Digital Tradition was forced to shut down because of copyright violations.

On the Bluegrass-L listserv, Dick Greenhaus wrote the following in July 1996:

"A music publisher complained that the Digital Tradition was
using some of its copyrighted songs without permission. Xerox, who
supported the DT website, immediately shut it down."

It was up and running again within a couple of months, at this site (or was it www.deltablues back then?).