Camp

[Kate Gilliver]

Marcus, you're maybe thinking of Trajan's Column which has plenty of scenes of soldiers doing things like entrenching, foraging and other work all in armour, though not always wearing helmets, which are sometimes shown nearby in case of emergency, placed on top of their pila which are stuck in the ground, and with scuta standing up beside them. Sorry, I can't find a good image online (the Stoa Trajan's Column site isn't cooperating this morning).
The soldiers are clearly working in hostile territory here though, so I guess what you do in re-enactment depends on whether your scenario is hostile territory or lounging around back at the fortress with no enemy anywhere in sight!