No sooner had intelligence of the death of Henry reached Scotland, than aware of the necessity for promptitude, David led an army across the frontier, and at the very moment of Stephen’s coronation in London, the Scottish king was receiving the allegiance of the northern barons in behalf of his royal niece. Carlisle and Norham, Werk, Alnwick, and Newcastle, in short all the border fortresses beyond the Tyne, with the exception of Bamborough, opened their gates at his appearance, and he had advanced far into the territory of St. Cuthbert, upon his route to Durham, when he was anticipated by the approach of a numerous army under Stephen. [Sidenote: A.D. 1136.] No time could have been lost by that prince in collecting his forces, as upon the 5th of February, little more than six weeks after his coronation, he marched into Durham. David retired upon Newcastle, and the two kings remained in a hostile attitude for another fortnight before a conference was arranged, at which conditions of peace were finally agreed upon. The Scottish king, still true to his oath, refused to hold any fiefs of Stephen; but Carlisle and Doncaster were conferred upon his son Henry, in addition to the Honour of Huntingdon, with a promise that the claims of the prince upon Northumberland, in right of his maternal ancestry, should be taken into consideration if the English king ever regranted that earldom. Peace was concluded upon these terms; all the castles surrendered to David were restored with the exception of Carlisle; and Henry, after performing homage at York for his English fiefs, accompanied Stephen upon his return to the south.[236] Advancing years, and a disposition naturally pliant and easy, are the reasons assigned by a contemporary historian for the acquiescence of David in the usurpation of Stephen; but however willing he might have been to support the cause of his niece Matilda, he must naturally have shrunk from sustaining the whole weight of a contest, in which he alone was in arms in her behalf. Nor must it be forgotten, that the wife of Stephen was equally a daughter of one of David’s sisters; and however the approach of age may have increased his aversion to war, it had hardly yet diminished his characteristic sagacity, as he was undoubtedly a gainer by the conditions of the peace.[237]