NovelGuide: Henry V: Novel Summary: Prologue
The prologue is delivered by the Chorus, who encourages the audience to use their imaginations to visualize the scene that is to be enacted on the stage before them.
The Chorus reappears at the beginning of each act to set the scene, to summarize events not shown, and to announce changes of location and passage of time. It is an acknowledgement of the limits of the theater in presenting such epic events as the battle of Agincourt. The audience must do its work too.