In his extremity Charles trusted himself to Herbert, count of Vermandois, who deceived him, and threw him into confinement at Château-Thierry and afterwards at Peronne.
Chateau-Thierry is built on rising ground on the right bank of the Marne, over which a fine stone bridge leads to the suburb of Marne.
Chateau-Thierry was formerly the capital of the district of Brie Pouilleuse, and received the title of duchy from Charles IX.
