Conversation so far:
where did the nickname red devils come from
Inspired by the English ruby club Salford who wore red shirts, the manager of Manchester United Matt Busby declared Manchester United should also be known as The Red Devils.
when did manchester united change to the current name
Founded as Newton Heath LYR Football Club in 1878, and changed its name to Manchester United in 1902.
why is manchester united special
Manchester United have won more trophies than any other club in English football.
has the club achieved any notable firsts
In 1998–99, Manchester United became the first in the history of English football to achieve the continental European treble.

Question: can you explain the feat
Self-contained rewrite: can you tell me about the treble