[340] Ademar of Chabanais, _Rer. Gall. Scriptt._, vol. x. p. 149. [341] “Vulgo, sed parum Latine, cognominari Evigilans-canem pro ingenti probitate promeruit. Nam ... in eundem [sc. Fulconem] arma levans nocturnas expeditiones crebro agebat, et Andegavenses homines et canes in ipsâ urbe, vel in munitioribus oppidis terrebat, et horrendis assultibus pavidos vigilare cogebat.” Ord. Vit. (Duchesne, _Hist. Norm. Scriptt._) p. 532. It is however only fair to add that in another place (_ib._ p. 487) Orderic says Herbert “vulgo Evigilans-canem cognominabatur, propter gravissimas infestationes quas a perfidis affinibus suis Andegavensibus incessanter patiebatur”--as if he kept the Cenomannian dogs awake to give notice of the enemy’s approach, we must suppose. [342] Ademar of Chabanais (_Rer. Gall. Scriptt._, vol. x.), p. 161; Will. Poitiers (Duchesne, _Hist. Norm. Scriptt._), p. 189; Will. Malm. _Gesta Reg._, l. iii. c. 235 (Hardy, p. 401). Ademar says Herbert’s imprisonment lasted two years; and the Chronn. S. Albin. and Vindoc. a. 1027 (Marchegay, _Eglises_, pp. 22, 167), give us the date of his release, by giving that of the Breton invasion which followed it. [343] “Hugonis ... quem Fulco senior sibi violentur subjugârat.” Ord. Vit. (Duchesne, _Hist. Norm. Scriptt._), p. 532. The terms of Herbert’s submission to Fulk are matter of inference from what followed his release. He at once began to quarrel with Avesgaud, the bishop of Le Mans, and being by him defied and excommunicated, called in the help of Duke Alan of Britanny (_Acta Pontif. Cenoman._, c. 30, in Mabillon, _Vet. Analecta_, p. 304). Alan, when he had helped to defeat the bishop, marched down to besiege Le Lude, one of the chief Angevin fortresses on the Cenomannian border, and only desisted when he had extorted from Fulk the hostages given him by Herbert on his release; Chron. Vindoc. a. 1027 (Marchegay, _Eglises_, p. 166). It is not hard to see why the rival overlord of Nantes should be ready to make war, on any pretext, upon the count of Anjou; but, making due allowance for Fulk’s possible difficulties--Odo’s last attack occurred in this year--still it is very hard to see why Fulk, “the ingenious Fulk,” as the writer of the _Gesta Amb. Domin._ calls him (Marchegay, _Comtes_, p. 165), could find no better way of raising the siege of a petty border-fortress than by making restitution to Herbert at the bidding of Alan, unless he felt so sure of his hold over Herbert as not to think the hostages worth keeping. The striking resemblance between Fulk’s treatment of Herbert and his father’s treatment of Guerech also