well as by neglecting to raze the castle of Gisors, which was built on the French side of the river Epte, the common boundary between both dominions.
But an incident soon offered, which gave king Henry a pretext for retaliating almost in the same manner: for it happened that upon some offence taken against his nephew Theobald count of Blois by the French king, Lewis in great rage sent an army to invade and ravage the earl's territories. Theobald defended himself for a while with much valour; but at length in danger to be overpowered, requested aid of his uncle the king of England, who supported him so effectually with men and money, that he was able, not only to defend his own country, but very much to infest and annoy his enemy. Thus a war was kindled between the two kings; Lewis now openly asserted the title of William the son of Robert, and entering into an alliance with the earls of Flanders and Anjou, began to concert measures for driving king Henry out of Normandy.
The king having timely intelligence of his enemy's designs, began, with great vigour and dispatch, to prepare for war: he raised, with much difficulty and discontent of his people, the greatest tax that had ever been known in England; and passing over into Normandy with a mighty army, joined his nephew Theobald. The king of France, who had entertained hopes that he should overrun the duchy before his enemy could arrive, advanced with great security toward the frontiers of Normandy; but observing an enemy of equal number and force already prepared to engage him, he sud-
