Answer:
Eteocles defends Thebes against his own brother, proving his loyalty.
Step-by-step explanation:
Eteocles defended Thebes going against his brother. This reflects his loyalty towards Thebes. Irrespective of sharing the blood relationship of being brothers, Eteocles' didn't defend his brother. Antigone and Ismene remained in the palace and waited for the conclusion of the conflict to alive. Eteocles preferred his country in front of his brother. The archetype of loyalty towards the country has been reflected in the excerpt.