Barnardo, a sentry

[This is an annotated list of all appearances and all mentions of Barnardo.]
Royal Shakespeare Company, 2008
"Who's there?" (1.1.1.) He relieves Francisco and leads Marcellus and Horatio up to the walls of the Castle, so that he and Marcellus can persuade Horatio that they really have seen a ghost. [Scene Summary]
"Good even, sir" (1.2.166). He accompanies Marcellus and Horatio to tell Hamlet about the Ghost. [Scene Summary]