ancient dragon battle grounds, where?!

The tale of the Lambton Wyrm (sometimes spelled Worm) is an English legend from the Middle Ages. It takes place near the River Wear in County Durham where Lambton Castle stands.
One day young John Lambton - heir to the Lambton name and estate - was out fishing in the river. After an unsuccessful day he finally caught something. Unfortunately it wasn't a fish but an unpleasant-looking eel-like creature.
Lambton threw the creature down a well (which became known as "Worm Well"), believing it would die. In fact it survived and grew - and grew.
Some years later, whilst John Lambton was away fighting in the Crusades, the wyrm, now fully grown, escaped from the well. It began to terrorise the region, killing and devouring local people.
The wyrm also kept on growing until it was large enough to wrap itself three times around the hill that was its home, which was unimaginatively named Worm Hill. The song of the Lambton Wyrm refers to "Pensher Hill", but some believe Worm Hill to be a small hillock to the North of the Wear near Fatfield Bridge.
John Lambton returned from the Crusades and swore to kill the Wyrm that he himself had unleashed. However he realised that it was too powerful for him.
So Lambton sought the help of a local witch. She agreed to cast a spell to help him, but there would be a price. After killing the Worm, Lambton would also have to kill the very next living creature he met on returning to Lambton Hall. He agreed.
With the help of the witch's spell and a coat of mail studded with spear-heads, John Lambton slew the Wyrm in a fierce battle. Exhausted from the battle, he returned home expecting to be met by one of the family dogs. In fact the first living thing he met was his father.
Lambton refused to kill his own father in cold blood. Because he broke his promise to the witch the Lambton family was cursed for nine generations.