What were the terms of the proposal de Villiers offered the British?

Louis Coulon, sieur de Villiers (17 August 1710 – 2 November 1757) was a French Canadian military officer during the French and Indian War (Seven Years' War). Perhaps his greatest claim to fame is the fact that he is the only military opponent to force George Washington to surrender.
Coulon was born into a prominent French Canadian family. His grandfather, Sieur Raoul-Guillaume Coulon, was a commandant in the French royal army.[1] He was the son of Nicolas Antoine Coulon de Villiers and Elizabeth Le Couturier.[2] Louis Coulon de Villiers entered the military in 1733. He had risen to the rank of captain by the outbreak of the French and Indian War and was assigned to Fort Duquesne.
His half-brother, Ensign Joseph Coulon de Jumonville, was killed by George Washington and his men after surrendering at the Battle of Jumonville Glen. Coulon sought justice and led an expedition to attack the British garrison at Fort Necessity under the command of George Washington.
On the morning of July 3, 1754, Coulon's troops attacked Fort Necessity (See Battle of the Great Meadows). By evening, the British had asked for terms of surrender. It was the only time in Washington's long military career when he surrendered to an enemy.