The battle of Fjaler was an engagement related to Harald Fairhair's unification of Norway.

After having subdued the kingdom of Firda

Firda

Firda is a Norwegian daily newspaper, published in Førde, Norway. The newspaper was founded in 1917 by Kristian Ulltang, who also was its first editor. Firda is the largest newspaper in Sogn og Fjordane. Editor-in-chief is Jan Atle Stang....

, Harald left for the east, placing Håkon Ladejarl

Håkon Grjotgardsson

Håkon Grjotgardsson , nicknamed Håkon the Rich was the son and heir of Grjotgard Herlaugsson Lade. Håkon became the ruler of the petty kingdom of Trøndelag, the Earl of Lade in the eastern part of Trondheim, Norway, when he succeeded his father...

 in possession of Firda. Håkon sent a messenger to earl Atle Mjove in Sogn

Sogn

Sogn is a traditional district in Western Norway . It is located in the county of Sogn og Fjordane, surrounding the Sognefjord. Sogn consists of the municipalities of Aurland, Balestrand, Hyllestad, Høyanger, Gulen, Leikanger, Luster, Lærdal, Sogndal, Solund, Vik, and Årdal. The district covers ...

, telling him the king Harald had given the order that Atle should give sign to him. Atle answered that he would do no such thing unless told by the king in person. Both earls then gathered an army, and they clashed by a place called Fialar in Sunnfjord. Both earls were killed in the battle.