Mara assaulted Siddhartha Gautama with memories of his life back in his palace; his armies of lust, desire, hunger and thirst; and even attempted to lure the young man with his lovely daughters. In a way, Mara is the embodiment of that feeling of self-doubt which is present inside of all of us.
But the former prince was having none of it. He extended the fingers of his right hand towards the ground and summoned the earth goddess Toranee to bear witness and help defend him from the attack. The goddess wrung her long hair, releasing a torrent of water that washed away Mara and his army.