There are two questionable points connected with these matters: 1. the date; 2. the geography.
1. The only original writer who gives a detailed account of both siege and treaty is Orderic, who carries his story straight on from the quelling of the revolt of Maine in 1073 to the siege of La Flèche, as if it had all happened in the same year, before William returned to England with his troops. On the other hand, none of the Angevin writers mention La Flèche under date 1073; but the Chronn. S. Albin. and S. Flor. Salm. (Marchegay, Eglises, pp. 26, 189) have “Exercitus de Fissâ,” the former in 1077, the latter in 1078; and in the Art de vérifier les Dates these entries are interpreted as referring to the siege which was followed by the treaty of Blanchelande. M. Voisin (Les Cénomans, p. 414) dates the whole affair 1085; he gives no reason and seems to be quite unsupported. The choice lies therefore between Orderic’s date and that of the Angevin chronicles. Mr. Freeman (Norm. Conq., vol. iv. pp. 560–563) follows Orderic, and I have done the same.
2. As to the geography. Orderic (Duchesne, Hist. Norm. Scriptt., p. 533) says that to meet William the Angevin and Breton host, leaving La Flèche, “Ligerim fluvium audacter pertransierunt.” Now this must be wrong, as the Loire is a long way south of La Flèche. It is clear that for Ligerim, “Loire,” we must read Liderim, “Loir,” as Mr. Freeman says (Norm. Conq., vol. iv. p. 562, note 2). Even crossing the Loir seems rather a strange proceeding; for La Flèche being on the right or north bank of that river, they must have crossed it to the southward—i.e. away from Normandy. How came it that William, marching against them out of Normandy, had gone so far down to the south of them?
There is however a further question as to the actual place of the treaty, which Mr. Freeman (as above, p. 562) places at Bruère in the Passais. If such was the case, Orderic’s story of the crossing of the river becomes quite hopeless, as Bruère is a long way north-west of La Flèche. But there is another version. J. Pesche in his Dictionnaire historique de la Sarthe, vol. i. p. 168, under “Blanchelande ou Blanche-bruyère,” says: “Vaste espace de terrain infertile, où croît abondamment le lichen des rennes, dont la blancheur lui aura fait donner son nom; situé entre La Flèche et Le Lude, côtoyé par la route qui conduit de l’une à l’autre de ces deux villes.” It is this which Pesche and, following him, M. Voisin (Les Cénomans, p. 414, note 1) mark as the scene of the treaty. So does M. Prévost in a note to Orderic, vol. ii. p. 258, and he adds that a farm there still in 1840 bore the name of Blanchelande. If this theory is correct, Orderic’s geography is quite right and clear; the besiegers of La Flèche, on the north side of the Loir, crossing over to its southern bank, would march straight upon the “white moor.” William must then have crossed higher up and made a circuit to the south-east of them. The only question remaining would be, what was his reason for this movement? To which there was doubtless a good military answer.
With regard to the second siege of La Flèche by Fulk Rechin, in 1081, there is a very strange story in the Chron. Rain. Andeg. (Marchegay, Eglises, p. 13). We are there told that Fulk not only took and burned the castle (as the Chron. S. Albin., ib. p. 26, also states under the same year) in revenge, for John’s rebellion against him, but also punished King William for his previous relief of the castle, by so worsting him in battle that he retreated after giving hostages for peace, among whom were his brother the count of Mortain and his own son! Mr. Freeman says nothing of this very apocryphal-looking story. Is it anything more than an Angevin travesty of Robert’s homage to Fulk at Blanchelande?