Editing Battle of Helm's Deep (section)

=== Later writings ===

After the publication of ''The Lord of the Rings,'' Tolkien wrote about the history of [[Rohan (Middle-earth)|Rohan]], in writings now collected by his son Christopher in ''[[Unfinished Tales]]''. These state that the fortresses of Aglarond and [[Angrenost]] (renamed Isengard by the Rohirrim) were built by [[Gondor]] to guard the shoulders of the [[Gap of Rohan]]. Like Angrenost to the north, it was initially well guarded, but as the population of [[Gondor#Calenardhon|Calenardhon]] dwindled it was not maintained and was left to a hereditary small guard who intermarried with [[Dunlending]]s. When Cirion, [[Steward of Gondor]], gave Calenardhon to the [[Éothéod]], Aglarond was transferred into the care of the Rohirrim, who named it ''Súthburg'' ("South-fortress" in Old English). The Gondorian guard was merged with that of Isengard. Guard duty of the Fords was initially shared between Gondor and Rohan, but later maintained only by the Rohirrim.<ref name="Cirion and Eorl" group=T>{{harvnb|Tolkien|1980|loc=part 3, ch. 3 "Cirion and Eorl and the Friendship of Gondor and Rohan"}}</ref>