During the tragic air battle on May 26th, 1944, Chartres was hit by
            American bombs, and the municipal library was almost entirely
            destroyed. On June 9th, 1944, the manuscripts that could be salvaged
            were sent to the Bibliothèque nationale de France for restoration
            work.1 Decades of careful work have been dedicated to repairing the
            damaged manuscripts and to analysing and identifying the surviving
            fragments.
             An example of a manuscript that was heavily damaged in 1944. The
                manuscript is Chartres Bibliothèque municipale, 0139 (0157),
                vol. 1, fol. 6v. Image credit : L’Institut de recherche et
                d’histoire des textes, 2013, Attribution-NonCommercial 3.0
                Unported (CC BY-NC 3.0).
              
The Municipal Library of Chartres manuscript collection was of great value, containing a remarkable number of Carolingian manuscripts (more information about the significance of the collection is available here.
According to Dominique Poire of the IRHT, “of the 518 listed manuscripts, 45% were totally destroyed" (this means about 233 were destroyed).2 About 248 manuscripts survive, some of which have been heavily damaged.3 A list of destroyed manuscripts and their contents is available here.
            One of the manuscripts that was lost from Chartres contained
            Guillelmus Peraldus’ Summa de vitiis. This work was a widely
            popular manual for priests about how to conduct confession by asking
            the penitent about various sins. It treats gluttony, lust, greed,
            sloth, pride, envy, wrath and the “sins of the tongue” (often in
            that order). Many other copies of the
            Summa de vitiis survive. This copy is fascinating because it
            was produced within decades of when Peraldus’ Summa de vitiis was
            written. Here are the details about this manuscript: 
Shelfmark
            : Bibliothèque municipale de Chartres, MS 204 (228)4 
Headnote :
            Guillelmus Peraldus, Summa de vitiis 
Date: 13th century
            
Folia: 193 
Material: Parchment 
Size : 300 x 200 mm
            
Decoration: Red ink ornaments 
Provenance: Chapter of
            Notre-Dame Cathedral, Chartres 
Contents: 
ff. 1-7: Table
            of contents (in a more recent hand) 
Incipit: “Incipit moralis
            tractatus in VIItem viciis. Dicturi de singulis viciis..” 
ff.
            7v-198: Guillelmus Peraldus, Summa de vitiis 
Incipit:
            “Pro XI francis, tractatus de VII visciis et remediis eorumdem usque
            ac (sic) XXti quatuor libros.” 
Explicit:
            
“Explicit summa de viciis. / Explicit hic liber, sit scriptor
            crimine liber. /Explicit, expliceat, ludere scriptor eat.”
            
Note: More on Peraldus’ Summa de vitiis is
            available here.
          
The explicit of the text in this manuscript resembles one in the Lawrence J. Schoenberg Collection MS no. ljs216.