The Battle of Cassel was fought in February 1071 between Robert I of Flanders (or Robert the Frisian) and his nephew, Arnulf III (son of

Baldwin VI of Flanders Baldwin VI ( 1030 – 17 July 1070), also known as Baldwin the Good, was Count of Hainaut from 1051 to 1070 (as Baldwin I) and Count of Flanders from 1067 to 1070. Baldwin was the eldest son of Baldwin V of Flanders and Adela, a daughter of Ki ...

). The battle was a victory for Robert, and Arnulf was killed in the battle. Arnulf succeeded his father Baldwin in 1070 and was supported by his mother

Richilde, Countess of Mons and Hainaut Richilde, Countess of Mons and Hainaut ( 1018 – 15 March 1086), was a ruling countess of Hainaut from c. 1050 until 1076, in co-regency with her husband Baldwin VI of Flanders (until 1070) and then her son Baldwin II of Hainaut. She was also c ...

. However, Robert challenged Arnulf's succession to the throne of

Flanders Flanders (, ; Dutch: ''Vlaanderen'' ) is the Flemish-speaking northern portion of Belgium and one of the communities, regions and language areas of Belgium. However, there are several overlapping definitions, including ones related to cultu ...

and began rallying support mainly in northern Flanders (where the bulk of Arnulf's forces were located). Arnulf's ranks contained individuals such as Count Eustace II of Boulogne and Count Eustace III of Boulogne. Moreover, Arnulf was supported by King

Philip I of France Philip I (23 May 1052 – 29 July 1108), called the Amorous, was King of the Franks from 1060 to 1108. His reign, like that of most of the early Capetians, was extraordinarily long for the time. The monarchy began a modest recovery from the low i ...

since Philip's aunt,

Adela Adela may refer to: * ''Adela'', a 1933 Romanian novel by Garabet Ibrăileanu * ''Adela'' (1985 film), a 1985 Romanian film directed by Mircea Veroiu * ''Adela'' (2000 film), a 2000 Argentine thriller film directed and written by Eduardo Mign ...

, married

Baldwin V of Flanders Baldwin V ( 1012 – 1 September 1067) was Count of Flanders from 1035 until his death. He secured the personal union between the counties of Flanders and Hainaut and maintained close links to the Anglo-Saxon monarchy, which was overthrown by hi ...

. A contingent of ten Norman knights led by

William FitzOsbern William FitzOsbern, 1st Earl of Hereford, Lord of Breteuil ( 1011 – 22 February 1071), was a relative and close counsellor of William the Conqueror and one of the great magnates of early Norman England. FitzOsbern was created Earl of Hereford ...

were among the forces sent by Philip to aid Arnulf. Robert's forces attacked Arnulf's numerically superior army before it could organize. Arnulf himself was killed along with William FitzOsbern, while Richilde was captured by Robert's forces. However, Robert himself was also captured by Eustace II. Ultimately, Richilde was exchanged for Robert's freedom. Robert became count of Flanders and ruled until 1093. He gained the friendship of King Philip by offering him the hand in marriage of his stepdaughter,

Bertha of Holland Bertha of Holland ( 1055 – 15 October 1094), also known as Berthe or Bertha of Frisia and erroneously as Berta or Bertrada, was Queen of France from 1072 until 1092, as the first wife of King Philip I of France. Bertha's marriage to the king in ...

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* * * * * * {{DEFAULTSORT:Cassel, Battle of (1071) Battles involving Flanders Battles involving France Battles in Hauts-de-France 1070s in France Conflicts in 1071 1071 in Europe History of Nord (French department) 11th century in the county of Flanders Wars of succession involving the states and peoples of Europe