Board Thread:General Mod Discussion/@comment-31907131-20170503081011/@comment-29773086-20170503204036

Veliks wrote:

The Hammer of Hammerhand
It was said that Helm had friends among the Dwarves, who helped fortify Helm's Deep and who gave him a gift of a mithril warhammer, which is rumored to have been hidden in the Glittering Caves at the Hornburg. Helm likely never used the hammer, so its existence has never been verified.

Source: http://lotr.wikia.com/wiki/Helm_Hammerhand

 It was said where?