ARRIERE-BAN n.
A proclamation, as of the French kings, calling not only their immediate feudatories, but the vassals of these feudatories, to take the field for war; also, the body of vassals called or liable to be called to arms, as in ancient France.
ATTORNMENT n.
The act of a feudatory, vassal, or tenant, by which he consents, upon the alienation of an estate, to receive a new lord or superior, and transfers to him his homage and service; the agreement of a tenant to acknowledge the purchaser of the estate as his landlord. Burrill. Blackstone.