 Around 14 AD, Caecina was the legate in charge of the legions along the lower Rhine frontier in Gallia Belgica (what would later become Germania Inferior), under the overall command of Germanicus.When the Rhine legions rebelled following the death of Augustus, the men under Caecina were at the forefront, demanding the demobilisation of men who had served an excessive number of campaigns, and an increase in pay for the rest.Caecina apparently lost his nerve over the mutiny.