Tolkien's Myth making in Helm's Deep

In the chapter Helm's Deep, in The Two Towers, Tolkien uses myth-making with the death and birth motif with Théoden's return to his senses just in time to save his beloved realm and people. Théoden was under the thrall of Wormtongue and was in the danger of having Rohan fall under the sway of shadow from Saruman evil designs. In a sense, Théoden was dying a slow death in a dream-like state, and if it wasn't for Gandalf (help given from a magical being) he most likely would have died in the literal sense. It was in the nick of time for Saruman's forces were converging on Rohan and perhaps it wasn't in time in Théoden's eyes as he was forced to retreat to Helm's Deep to make his last heroic stand. Théoden was already pretty much thinking it would be his last battle and that he failed his people. The King of Rohan decided that it would be one last charge against the enemy to either break out of the encircled troops to freedom or die trying. In the last moments as Théoden led what may have been an ill-fated last heroic charge into the face of death, Gandalf showed up with Erkenbrand and the rest of Rohan's army to help guarantee Théoden's chances for victory over Saruman's forces. It seems to me that the death and rebirth motif fits well here with Tolkien's mythology. Théoden almost perished and died from the mental sway of Wormtongue but was given a second chance at life with the help of Gandalf. Théoden not only prevented his death but his nations as well and was reborn in a sense and given another chance to live and to protect his kingdom and people.