Escuage
Escuage (?; 48) , noun
[Old French escuage, French écuage, from Old French escu shield, French écu. See Esquire.]
(Feud. Law) Service of the shield, a species of knight service by which a tenant was bound to follow his lord to war, at his own charge. It was afterward exchanged for a pecuniary satisfaction. Called also scutage. — Blackstone