Robertian victory The Battle of Soissons was fought on 15 June 923 between an alliance of Frankish insurgent nobles led by Robert I, elected king in an assembly the year prior, and an army composed of Lotharingians, Normans, and Carolingian forces under King Charles III's command.

[7] After Charlemagne's death, the Carolingian royal authority began to decline due to the constant invasions of the Vikings, civil wars and strife with vassals, mainly the Robertians.

[14] In 920 a group of Frankish nobles led by Robert, brother of the previous king Odo, abducted Charles.

This act directly affected the Robertians' interests, since Rothilde was the mother-in-law of Robert's son, Hugh the Great.

[16][17] In an assembly at Soissons on June 29, the rebellious nobles deposed Charles and elected Robert as their king.