When the European Huns came to Eastern Europe as a result of the Migration of Tribes, that they initiated, they acted in an organized manner with the communities in Eurasia and posed a great threat as soon as they arrived in the region. The European Huns, who were constantly trying to obtain booty and land with raids in the east and west, made agreements with the Eastern and Western Roman Empires with a diplomatic move during the Uldız period and expanded their lands from the Danube to Hungary. This move of Uldız also determined the foreign policy of the European Huns in the following years. The Gallic Expedition, which coincided with the last periods of Attila's successful reign, bears traces of the Turkish military tradition in terms of its planning, realization and results. Although the result of the campaign is shown as a great defeat for the Huns in the sources, the situation changes when examined in detail. In our study, we aim to give detailed information about the reasons that prepared the Gallic Expedition, the course and results of the expedition.