Neither the bow nor the sling featured greatly among the weapons of the Celtic warrior, though both were used to some extent. For the former (bows) there is very little archaelogical evidence, although some iron arrowheads have been discovered at the site of Alesia in Gaul. For the latter (slings), there is ample evidence. Vast stockpiles of slingstones have been unearthed within several of the hill-forts in southern Britain, a clear indication that their use was a major factor in the defence of these sites. Nevertheless , the use of the sling is not mentioned in any set-piece battle.
An explanation is not difficult to find, bearing in mind the ethos of the Celtic warrior. Both the bow and sling are missile weapons best employed at a distance. Moreover, anyone can learn to use either weapon; they do not even have to use them particularly accurately to be effective. The Gallic leader Vercingetorix is reported to have called for all the archers who could be found in Gaul to be sent to him to make up for his losses after the seige of Avaricum. The implication here is that, despite the many thousands of warriors who were already fighting with him (according to Caesar over 250,000) these archers were not among them and might not otherwise have been expected to fight. Furthermore, the principal engagements following Avaricum were two other seiges, at Gergovia and Alesia. Vercingetorix used his archers to help defend his strongholds, just as slingers defended British hill-forts.
The conclusion that has to be drawn is clear. The Celtic warrior used neither the bow nor the sling because they were not considered to be a warrior's weapons. His goal on the battlefield was to engage the enemy at close quarters with spear and sword, and to measure his prowess against that of his opponent in single combat. To stand off and shoot at him from a distance was unthinkable. Where was the honor in that?