Nevertheless, it is clear that the cohort provided several advantages over the manipular organization. Then he reorganized the legions into the cohort system, doing away with the manipular system. In the 4th century, the Romans replaced it with the more flexible manipular formation. The manipular army was based upon social class, age and military experience. The manipular system was adopted around 315 BC, during the Second Samnite War. The manipular system was abandoned during the Marian reforms that began in 107 BC. The central feature of the mid-Republican army was the manipular organisation of its battle-line.