van Rossum 2004, p.115Roselaar 2016, p.150, Derks & Teitler 2019, p.57, think there might have been 9 such cohorts at one point. van Rossum, J.A. (2004), "The end of the Batavian auxiliaries as 'national' units", in de Ligt, Luuk; Hemelrijk, Emily; Singor, H.W. (eds.), In Roman Rule and Civic Life: Local and Regional Perspectives. Proceedings of the Fourth Workshop of the International Network Impact of Empire, Impact of Empire, vol.4, Brill, doi:10.1163/9789004401655_008, ISBN9789004401655 Roselaar, Saskia T. (2016), "State-Organised Mobility in the Roman Empire: Legionaries and Auxiliaries", In Migration and Mobility in the Early Roman Empire, Brill, doi:10.1163/9789004307377_008 Derks, Tom; Teitler, Hans (2019), "Batavi in the Roman Army of the Principate: An Inventory of the Sources", Bonner Jahrbücher, 218: 53–80
Neumann 2008, pp.32–33. Neumann, Günter (2008) [1983], "Die Sprachverhältnissein den germanischen Provinzen des Römischen Reiches", Namenstudien zum Altgermanischen, De Gruyter, doi:10.1515/9783110210446
van Rossum 2004, p.115 citing Tacitus Histories, 4.16, and contrasting it to the opposed unit under Labeo in 4.18. Roselaar 2016, p.150 counts these as one unit. van Rossum, J.A. (2004), "The end of the Batavian auxiliaries as 'national' units", in de Ligt, Luuk; Hemelrijk, Emily; Singor, H.W. (eds.), In Roman Rule and Civic Life: Local and Regional Perspectives. Proceedings of the Fourth Workshop of the International Network Impact of Empire, Impact of Empire, vol.4, Brill, doi:10.1163/9789004401655_008, ISBN9789004401655 Roselaar, Saskia T. (2016), "State-Organised Mobility in the Roman Empire: Legionaries and Auxiliaries", In Migration and Mobility in the Early Roman Empire, Brill, doi:10.1163/9789004307377_008
van Rossum 2004, p.115Roselaar 2016, p.150, Derks & Teitler 2019, p.57, think there might have been 9 such cohorts at one point. van Rossum, J.A. (2004), "The end of the Batavian auxiliaries as 'national' units", in de Ligt, Luuk; Hemelrijk, Emily; Singor, H.W. (eds.), In Roman Rule and Civic Life: Local and Regional Perspectives. Proceedings of the Fourth Workshop of the International Network Impact of Empire, Impact of Empire, vol.4, Brill, doi:10.1163/9789004401655_008, ISBN9789004401655 Roselaar, Saskia T. (2016), "State-Organised Mobility in the Roman Empire: Legionaries and Auxiliaries", In Migration and Mobility in the Early Roman Empire, Brill, doi:10.1163/9789004307377_008 Derks, Tom; Teitler, Hans (2019), "Batavi in the Roman Army of the Principate: An Inventory of the Sources", Bonner Jahrbücher, 218: 53–80
van Rossum 2004, p.115. van Rossum, J.A. (2004), "The end of the Batavian auxiliaries as 'national' units", in de Ligt, Luuk; Hemelrijk, Emily; Singor, H.W. (eds.), In Roman Rule and Civic Life: Local and Regional Perspectives. Proceedings of the Fourth Workshop of the International Network Impact of Empire, Impact of Empire, vol.4, Brill, doi:10.1163/9789004401655_008, ISBN9789004401655
van Rossum 2004, p.118, Roselaar 2016, p.151 van Rossum, J.A. (2004), "The end of the Batavian auxiliaries as 'national' units", in de Ligt, Luuk; Hemelrijk, Emily; Singor, H.W. (eds.), In Roman Rule and Civic Life: Local and Regional Perspectives. Proceedings of the Fourth Workshop of the International Network Impact of Empire, Impact of Empire, vol.4, Brill, doi:10.1163/9789004401655_008, ISBN9789004401655 Roselaar, Saskia T. (2016), "State-Organised Mobility in the Roman Empire: Legionaries and Auxiliaries", In Migration and Mobility in the Early Roman Empire, Brill, doi:10.1163/9789004307377_008
van Rossum 2004, pp.118–119. van Rossum, J.A. (2004), "The end of the Batavian auxiliaries as 'national' units", in de Ligt, Luuk; Hemelrijk, Emily; Singor, H.W. (eds.), In Roman Rule and Civic Life: Local and Regional Perspectives. Proceedings of the Fourth Workshop of the International Network Impact of Empire, Impact of Empire, vol.4, Brill, doi:10.1163/9789004401655_008, ISBN9789004401655
van Rossum 2004, pp.121–123. van Rossum, J.A. (2004), "The end of the Batavian auxiliaries as 'national' units", in de Ligt, Luuk; Hemelrijk, Emily; Singor, H.W. (eds.), In Roman Rule and Civic Life: Local and Regional Perspectives. Proceedings of the Fourth Workshop of the International Network Impact of Empire, Impact of Empire, vol.4, Brill, doi:10.1163/9789004401655_008, ISBN9789004401655
van Rossum 2004, pp.119, 120–121, Roselaar 2016, p.151 van Rossum, J.A. (2004), "The end of the Batavian auxiliaries as 'national' units", in de Ligt, Luuk; Hemelrijk, Emily; Singor, H.W. (eds.), In Roman Rule and Civic Life: Local and Regional Perspectives. Proceedings of the Fourth Workshop of the International Network Impact of Empire, Impact of Empire, vol.4, Brill, doi:10.1163/9789004401655_008, ISBN9789004401655 Roselaar, Saskia T. (2016), "State-Organised Mobility in the Roman Empire: Legionaries and Auxiliaries", In Migration and Mobility in the Early Roman Empire, Brill, doi:10.1163/9789004307377_008
van Rossum 2004, p.115 citing Tacitus Histories, 4.16, and contrasting it to the opposed unit under Labeo in 4.18. Roselaar 2016, p.150 counts these as one unit. van Rossum, J.A. (2004), "The end of the Batavian auxiliaries as 'national' units", in de Ligt, Luuk; Hemelrijk, Emily; Singor, H.W. (eds.), In Roman Rule and Civic Life: Local and Regional Perspectives. Proceedings of the Fourth Workshop of the International Network Impact of Empire, Impact of Empire, vol.4, Brill, doi:10.1163/9789004401655_008, ISBN9789004401655 Roselaar, Saskia T. (2016), "State-Organised Mobility in the Roman Empire: Legionaries and Auxiliaries", In Migration and Mobility in the Early Roman Empire, Brill, doi:10.1163/9789004307377_008
Petrikovits 1981, p.379 citing Dio Cassius, Roman History, 54.36. Petrikovits, Harald (1981), "Chatten II. Historisches", in Beck, Heinrich; Geuenich, Dieter; Steuer, Heiko (eds.), Reallexikon der Germanischen Altertumskunde, vol.4 (2ed.), De Gruyter, pp.379–386, ISBN978-3-11-006513-8