Yes, further, it is worth pointing out that the Roman army was multi-skilled, there has even been a gravestone found which appears to depict a Legionary archer from the Flavian period.
The Legionaries regularly used spears when confronted with massed cavalry, or used their pila for that purpose. The Antesignani were light screening troops who needed to hold the line until the other Cohorts could form an order of battle, regardless of their other uses this is their primary use in EB.
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