Hjaðningavíg (the "battle of the Heodenings"), the legend of Heðinn and Hǫgni or the Saga of Hild is a Scandinavian legend from Norse mythology about a never-ending battle which is documented in Sörla þáttr, Ragnarsdrápa, Gesta Danorum, Skíðaríma and in Skáldskaparmál. It is also held to appear on the image stone at Stora Hammar on Gotland (see illustration). Moreover, it is alluded to in the Old English poems Deor and Widsið, and in the Old Norse Háttalykill inn forni, and a version of it survived down to the 18th century in the traditional Norn-language ballad "Hildina".
Like the names Heðinn (O.E. Heoden) and Hǫgni (O.E. Hagena), the legend is believed to have continental Germanic origins.
In the Skáldskaparmál and in Ragnarsdrápa, it is related that once when Hǫgni was away, his daughter Hildr was kidnapped by a prince named Heðinn, the son of Hjarrandi (O.E. Heorrenda). When Hǫgni came back, he immediately started to search for her. In the older poem Ragnarsdrápa, Hǫgni finally found her and the island where Heðinn waited with his army. This island is explained as the island of Hoy in Orkney by Snorri Sturluson in Skáldskaparmál.
Hildr welcomed her father and offered him peace and a necklace on behalf of Heðinn. However, Hǫgni had already unsheathed his sword Dáinsleif, which gave wounds that never healed and like Tyrfing always killed a man once it had been unsheathed. A battle ensued and they fought all day and many died. In the evening Heðinn and Hǫgni returned to their camps, but Hildr stayed on the battle-field. She resurrected them with incantations and the fallen soldiers started to fight anew, and this went on until Ragnarök.