Early Finnish wars
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Scattered descriptions on wars against Finland or between the Finns and the neighboring peoples prior to Finland becoming a part of Sweden has survived in Icelandic sagas, German, Norwegian, Danish and Russian chronicles and Swedish legends. Most of the early Finnish wars remain unhistorical and cannot be verified from reliable sources.
Conflicts with Swedes
The Ynglinga saga tells about the first known military expedition to Finland. Based on the saga's internal chronologies, the war presumably took place at the end of the 4th century, six generations before the time of the semi-historical Swedish king Ohthere (Vendelkråka). However, it is disputed whether the Old Norse concept of "Finland" is always meant to refer to the approximate area of the present-day country of Finland; alternatively it could have in some instances meant the land of the Sámi, or Finnmark ("mark" meaning land) in Northern Scandinavia.
- "It happened one summer that King Agne went with his army to Finland, and landed and marauded. The Finland people gathered a large army, and proceeded to the strife under a chief called Froste. There was a great battle, in which King Agne gained the victory, and Froste fell there with a great many of his people. King Agne proceeded with armed hand through Finland, subdued it, and made enormous booty."
- "Sigurd Ring (Sigurðr) was not there, since he had to defend his land, Sweden (Svíþjóð), since Curonians (Kúrir) and Kvens (Kvænir) were raiding there."
In 862, some Finnic and Slavic tribes rebelled against the Varangian Rus', driving them overseas back to Scandinavia. This took place according to the Primary Chronicle.
King Eric Anundsson is told to have conquered Finland in the late 9th century, along with several other eastern countries. However, all other accounts of the king exclude Finland from his conquests:
- "My grandfather Thorgny could well remember the Upsala king Eirik Eymundson, and used to say of him that when he was in his best years he went out every summer on expeditions to different countries, and conquered for himself Finland, Karelia, Courland, Estonia, and the eastern countries all around."
In 1187, the royal and commercial centre of the Sveas (Swedes) Sigtuna was raided and burned by attack from easterly direction, according to Eric's Chronicle in 1335. The Karelians are blamed for the offense.
In 1216, the Danish historian Saxo Grammaticus writes in Gesta Danorum about kings who ruled over Finland and Kvenland and about the Scandinavian royal families which based on several medieval sources descend from them.
Grammaticus' writings share a likeness and many characters and stories with the writings of Snorri Sturluson. Based on Grammaticus, many heroic Scandinavian figures have Finnic roots. Of the legendary Battle of Bråvalla (c. 750) - Sveas (Swedes) against the Geats - he writes:
- "Now the bravest of the Swedes were these: Arwakki, Keklu-Karl ..."
Terra Feminarum, described in Gesta Hammaburgensis Ecclesiae Pontificum (Deeds of Bishops of the Hamburg Church) by Adam of Bremen in 1075, is presumed to refer to the Finnic Kvenland, which at the time covered a part of the modern-day Finland. Terra Feminarum was attacked by the "Sueones" (Swedes) in 1050s.
According to the source, the attack ended in a Swedish defeat and led to a death of the king's son who was in charge of the campaign. The details given on the conflict are however convoluted.
Medieval Swedish legends
An alleged Swedish war against Finland took place in the 1150s, known as the First Swedish Crusade. Whether it ever actually happened is however disputed, as the information is based on a late 13th century legend, which has been claimed untrustworthy.
The southern part of the modern-day Finland became an integrated part of Sweden from early on. According to Eric's Chronicle from the 1320s, that happened as a result of a Swedish crusade to the southern part of the modern-day Finland in c. 1250. However, no other document discusses the crusade, and Eric's Chronicle provides contradicting information. The account is largely propagandist in nature, written amidst internal unrest and war against Novgorod.
Conflicts with Norwegians
In 873, according to the Egil's saga - written in c. 1240 -, the Kvens and Norse cooperated in battling against the invading Karelians. The chapter XVII of Egil's saga describes how Thorolf Kveldulfsson (King of Norway's tax chief starting 872 AD) from Namdalen, located in the southernmost tip of the historic Hålogaland, goes to Kvenland again. Based on medieval documents, the meeting took place during the winter of 873-874:
- "That same winter Thorolf went up on the fell with a hundred men; he passed on at once eastwards to Kvenland and met King Faravid."
In 885 (c.), the Account of the Viking Othere tells that the Norwegian and the Kvens were in conflict with each other from time to time: The account is a report based on Ohthere's (Ottar) voyage of the oceanic coasts of Northern Scandinavia and today's extreme northwestern Russia. The Kvens are referred to as "Cwenas" who live in "Cwena land". This was the first genuine account about the North. Thus, it is a principal source in studies relating to the Nordic history.
In 890, Ottar reports the findings to King Alfred of Wessex, who has Ottar's account included to the omissions and additions added to the Universal History of Orosius, republished by King Alfred. The book is partially a work of Orosius and partially of King Alfred.
The Kven Sea is mentioned as the northern border for ancient Germany. The location of Kvenland is also explained in the following ways:
- "Ottar (Ohthere) said that the Norwegians' (Norðmanna) land was very long and very narrow ... and to the east are wild mountains, parallel to the cultivated land. Sami people (Finnas) inhabit these mountains ... Then along this land southwards, on the other side of the mountain (sic), is Sweden ... and along that land northwards, Kvenland (Cwenaland).
- The Cwenas (Kvens) sometimes make depredations on the Northmen over the mountains, and sometimes the Northmen on them; there are very large freshwater meres amongst the mountains, and the Kvens carry their ships over land into the meres, and thence make depredations on the Northmen; they have very little ships, and very light."
(Notably, there is a reference in the Orkneyinga saga to the Southern Norwegian lake district, including the Lake Mjøsa area, the inhabitants of which were attacked by men from Kvenland, according to the saga.)
In 1007 (c), King Olaf II of Norway (Olaf II Haraldsson, Saint Olaf, 995 – July 29, 1030) plundered in Finland and almost got himself killed at the Battle at Herdaler, according to the Saga of Olaf Haraldson, a saga within the Heimskringla saga.
- The introduction to the Orkneyinga saga - a.k.a. Fundinn Noregr ('Foundation of Norway') - provides information about Fornjót, a king who ruled over Finland, Kvenland and Gotland, and the conquest of Norway by his descendant, Nór, who travelled to Norway from Kvenland. Based on saga's internal chronologies, the war would have taken place on the 6th or 7th century. The saga also provides details on the royal descendants of Gór, Nór's brother.
- The Hversu Noregr byggðist (Old Norse: How Norway was inhabited) is an account of the origin of various legendary Norwegian lineages. The account is sometimes called Fundinn Noregr, 'Foundation of Norway'. It traces the descendants of the primeval ruler Fornjót down to Nór, who is here the eponym and first great king of Norway, and then gives details of the descendants of Nór and of his brother Gór in a following section known as the Ættartölur ('Genealogies'). The Hversu account is closely paralleled by the opening of the Orkneyinga saga, which provides details on the descendants of Gór only, including information not found in the Hversu or the Ættartölur accounts.
In 1251, the Karelians fight against the Norwegians.
In 1271, the Kvens and the Karelians cooperate in battles against the Norwegians in Hålogaland, in Northern Norway, according to Icelandic chronicles. These battles had a lasting effect in the geopolitical landscape of the entire Northern Scandinavia:
- "Then Karelians (Kereliar) and Kvens (Kvænir) pillaged widely in Hålogaland (Hálogalandi)."
Conflicts with Danes
Vague chronicle entries shortly mention Danish expeditions to Finland in the 1190s and in 1202. Nothing is known about their results except what can be read from a papal letter from 1209 to the Archbishop of Lund, which lets the reader understand the church in Finland to be at least partly established by Danish efforts.
Conflicts with Novgorod
The series of wars waged during the 12th and early 13th centuries between Finnic groups and the Republic of Novgorod probably contributed to the Finns' eventual subjugation to the Catholic Church and the Kingdom of Sweden.
- Norna-Gests þáttr, chapter 7. See also the English translation.
- Saga of Olaf Haraldson. See chapter 81. THORGNY'S SPEECH.
- http://hbar.phys.msu.su/gorm/chrons/bremen.htm Adam of Bremen, Gesta Hammaburgensis ecclesiae pontificum, online text in Latin. English translation of the selected sections is provided by the author of the article, since translations are not available in public domain. Discussion about translation is welcome.
- Kyösti Julku: Kvenland - Kainuunmaa. With English summary: The Ancient territory of Kainuu. Oulu 1986. See pages 11 - 24.
- Ottar's description of Kvenland.
- http://omacl.org/Heimskringla/haraldson1.html Saga of Olaf Haraldson. See chapter 8: The Third Battle.
- Íslenzkir annáler sive Annales Islandici ab anno Christi 809 ad annum 1430, pp. 140–141. Translation provided here is by the author of the article.
- "Excerpts from different Danish chronicles mentioning Finland". Archived from the original on 2007-09-27.. In Latin. Hosted by the National Archive of Finland. See  and Diplomatarium Fennicum from the menu.
- "Letter "Ex Tuarum"". Archived from the original on 2007-08-14.. In Latin.
- See article Swedish-Novgorodian Wars.