Original: Another work of this period, Et exspecto resurrectionem mortuorem, was commissioned as a commemoration of the dead of the two World Wars, and was performed first semi-privately in the Sainte-Chapelle, then publicly in Chartres Cathedral with Charles de Gaulle in the audience.
Simplified: It was performed in the Sainte-Chapelle in Paris and then in Chartres Cathedral in 1965 in the presence of General Charles de Gaulle.