I didn't know that RJB.
did you know:
The common meaning of curfew is a designated hour at which adolescents are required to be home in the evening by order of their parents or when all citizens or military personnel are required to retreat indoors by order of the state. But it is derived from the French covrefeu spoken in the middle ages, which was the signal to bank a fire for the evening and further means "cover the fire". The root feu itself is derived from the Latin focus which means "hearth".
Walter de la Mare, however, uses it in a poem in another manner as he talks about "...when the curfew bird has flown..."
JPB, I no longer watch the History Channel. I just look for Setanta to inform me.