http://kingsandgenerals.libsyn.com/6-celts-before-caesar
A good podcast released by Kings and Generals channel. The quality in term of accuracy is above the videos, although it doesn't really discuss the military aspect.
For a few corrections, between 8:00 and 9:00. the speaker should have more emphasized the role of the Etruscans in the contact between Northern regions and Mediterranean civilizations.
At 11:40, the speaker pronounced "La Tène" as Latèné pronouncing the last e as an English speaking person will pronounce the letter e when he recite the alphabet. Actually, in French we pronounced the letter e more like an English person says uh/euh, and at the end of a word this sound is very little pronounced. Here an example of pronunciation at 1:45. This is a small and not important error but I took the opportunity to correct this common issue.
Between 16:30 and 17:00, the speaker highlights the issue of the origins of the Celtic culture (especially Celtic language). It is true that the Hallstatt narrative as a sole explanation for the Celtic expansion is dull and mostly abandoned by modern scholars. But he mentioned the idea of a western origin as a valid theory. However, the hypothesis pushed by Cunliffe and Koch that the Celtic languages comes from the West is mostly based on the idea that indo-european languages doesn't come from Steppic expansion (Kurgan hypothesis) but from Eastern neolithic (for Cunliffe's stand) or that Celtic languages do not come from the same indo-european migration (steppic) but from a later Anatolian migration of culture already bearing an indo-european culture (for Koch's stand). Honestly, this is only misplaced nationalism among two old scholars and there is really nobody following their view. They only got mediatized outside the academic world, this is why people thinks this is a valid theory among scholars. This is not the case. Archaeogenetics shattered their hypothesis about indo-europeans.
At 26:16, the speaker says the Celts didn't build roads. This is not true, the first Roman roads got built upon previous roads:
https://www.dailymail.co.uk/sciencetech/article-1366468/Roman-road-doubt-discovery-cobbled-built-100-years-invasion.html
https://www.theguardian.com/science/2011/mar/15/britannia-roman-roads-iron-age
https://halshs.archives-ouvertes.fr/halshs-00639254/document
https://www.persee.fr/doc/efr_0000-0000_1989_ant_116_1_3707#efr_0000-0000_1989_ant_116_1_T1_0741_0000
Finally at 26:55, the speaker says the Romans had the advantage of a industrial production of weapons for their soldiers. While the Gauls not. This is true however the latter claim that the chain mail is only for the ruling elite is a bit disputed by late La Tène findings. Especially one I worked on it as a technician. It was a deposit of artisanal waste with a large chain mails piece, mixed with broken objects, unfinished products and productions failures. It doesn't suit the idea of a high valuable object. The chain mail is probably not widespread in the whole warrior class but assuming it is only for high-members of the La Tène society is maybe too extreme. At the end of the La Tène culture, iron production is starting to be very important and close to what is seen in the Mediterranean world. Rome's productivity is exceptional in comparison of Greek cities and I think it is a bad idea to compare everything with Rome.