For now i don't know if the flag is usefull ( giving buffs to allies or anything like that) but event if it is, i really don't think anyone would want to play it, except to maybe troll around. As he can't do anything, not even pick up a weapon, when the "real" events will start i'm pretty sure nobody will be pleased if their officer forces them to play as Flag Bearer.
So i suggest we give them a Sword (or maybe a smaller flag that they could use as a spear? don't know if it's histrocally accurate tho) and the option to stuck the flag in the ground ( or at least dropping it) so they can do something else than just standing near the Line.
I also think it would be nice if the flag could be "planted" on the ground, so it can keep giving buffs (if it gives any) to nearby troops while letting he bearer take cover or defend the line from potential charges. Then he'll have to pick it up again to move with the line.
Basically, please give the flag bearer a gameplay that makes people enjoy playing it
thanks