Summarize the background information that the chorus gives in its song in Antigone. How does the chorus view Polyneices?

The entry-song of the chorus, located in lines 100 - 154 of Sophocles' drama Antigone, poetically tells the story of what occurred the night before the play begins. Polyneices and Eteocles, brother-heirs to the throne of Thebes and also brothers to Antigone and Ismene, had fought brutally to the point of killing each other with their spears.

There is a bit of background information not included in the chorus's song. Polyneices, Eteocles, Antigone and...

The entry-song of the chorus, located in lines 100 - 154 of Sophocles' drama Antigone, poetically tells the story of what occurred the night before the play begins. Polyneices and Eteocles, brother-heirs to the throne of Thebes and also brothers to Antigone and Ismene, had fought brutally to the point of killing each other with their spears.

There is a bit of background information not included in the chorus's song. Polyneices, Eteocles, Antigone and Ismene were the children of Oedipus the king, who had killed his father and married his mother unwittingly. Oedipus' actions led to his own death and an effectual curse on his family. When Oedipus died, Polyneices and Eteocles were too young to rule Thebes so they allowed their uncle, Creon, to hold the throne as regent until they were of age. They began to argue over who would be the most powerful, and eventually Eteocles managed to oust Polyneices, who fled to Argos and drummed up an army.

The chorus's song picks up when the morning comes and begins with a praise of the sun, and a giving of thanks for victory. The chorus reveals that Polyneices had picked a fight with Eteocles and had attacked the city of Thebes like an eagle, screaming and swooping down for its prey. They view Polyneices as being bloodthirsty and vengeful, and almost blinded to reason by his hatred (see lines 118, 130, 136-37). 

This view of Polyneices is likely the view that many Thebians would have had, since Polyneices was considered a traitor. He attacked his home city with a large army in an attempt to take back what he believed was his: the power to rule the city. The chorus's song claims that the city was saved by the will and help of Zeus when Polyneices' army fled under Eteocles' counter-attack at the city gates.