When Lord Rama was cutting his exile with his Bharara Sita and Bhai Laxman, then the monster King Ravana of Lanka Nagar had defeated Goddess Sita with treachery and took him captive and forcibly took him to Lanka town across the sea.
To free the mother Sita, Shri Ram Laxman, Lord Hanuman, Jambwan, Vibhishan and his friend Sugriva and his army had reached the beach so that the Goddess Sita could be freed by crossing the sea and fighting Ravana.