'Ring' in the Bible

And David got up and came to the place where Saul's tents were: and David had a view of the place where Saul was sleeping with Abner, the son of Ner, the captain of his army: and Saul was sleeping inside the ring of carts, and the tents of the people were all round him.

So David and Abishai came down to the army by night: and Saul was sleeping inside the ring of carts with his spear planted in the earth by his head: and Abner and the people were sleeping round him.