quality:corruption, structural:summarization
Participation in the Roman army

Germanic peoples, including those tribes in the Rhine delta that later became the Franks, are known to have served in the Roman army since the days of Julius Caesar. After the Roman administration collapsed in Gaul in the 260s, the armies under the Germanic Batavian Postumus revolted and proclaimed him emperor and then restored order. From then on, Germanic soldiers in the Roman army, most notably Franks, were promoted from the ranks. A few decades later, the Menapian Carausius created a Batavian–British rump state on Roman soil that was supported by Frankish soldiers and raiders. Frankish soldiers such as Magnentius, Silvanus, Ricomer and Bauto held command positions in the Roman army during the mid 4th century. From the narrative of Ammianus Marcellinus it is evident that both Frankish and Alamannic tribal armies were organised along Roman lines.

After the invasion of Chlodio, the Roman armies at the Rhine border became a Frankish "franchise" and Franks were known to levy Roman-like troops that were supported by a Roman-like armour and weapons industry. This lasted at least until the days of the scholar Procopius (c. 500 – c. 565), more than a century after the demise of the Western Roman Empire, who wrote describing the former Arborychoi, having merged with the Franks, retaining their legionary organization in the style of their forefathers during Roman times. The Franks under the Merovingians melded Germanic custom with Romanised organisation and several important tactical innovations. Before their conquest of Gaul, the Franks fought primarily as a tribe, unless they were part of a Roman military unit fighting in conjunction with other imperial units.