Late Roman Army (Fifth century)

[P. Lilius Frugius Simius]

...
Victor Vitensis (Book I.2) names 80.000 Vandals, including women and children, as well as their Alan allies.

Then, the vandals may have carried 10.000-15.000 warriors (more or less), no?

After some studies and calculations done in another thread, I've learned that warrior societies could sistematically sustain about 20% of their population as warriors.

Depending on the number of casualties before crossing from Betica to Mauretania, the Hasdingi Vandals and their (small number of) allied Alans could amount up to 16,000 without starting to look an anomaly. Also, I haven't found info on the nature of the Alans who survived to the huge carnage of Silingi Vandals and Alans in the 420s by Vesi Goths and Romans, thus the percentage of warriors could be higher or lower, depending if there were more or less Alan civilians...

Anyway 15,000 seems a reasonable enough number, considering they were able to completely control both Mauretaniae, siege Hippona, and later on move towards Carthage itself.

Hope this helps