Page from Joseph Plunkett's field notebook recording events from inside the G.P.O.

… a small number (described
as “about twenty”) succeeded
in advancing as far as
the G.P.O. but on our
opening fire they retired
in confusion leaving
a few casualties.
Simultaneously with our operation
positions were successfully
taken up in the front and
rear of Dublin Castle
and troops in that stronghold
prevented from coming out