| Leaving Robert of Mortain in charge of Lincolnshire, he turned west and defeated the Mercian rebels in battle at Stafford. |
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| Following the capture of Avranches, Mortain and Cherbourg, Rouen surrendered to him in 1144 and he then had himself anointed as Duke of Normandy. |
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| Henry II absorbed the County of Mortain but wanted to grant Boulogne to Thierry's second son, Matthew, who married Marie of Boulogne. |
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| In 1159, William of Blois died without an inheritance, he was Stephen's last son, leaving the titles of Count of Boulogne and Count of Mortain vacant. |
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| Ultra decrypts of German communications had been helpful as well, exposing German dispositions and revealing their plans such as the Mortain counterattack. |
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