from
Bouvier's Law Dictionary, Revised 6th Ed (1856)
INFRA PRAESIDIA. This term is used in relation to prizes, to signify that
they have been brought completely in the power of the captors, that is,
within the towns, camps, ports or fleet of the captors. Formerly, the rule
was, and perhaps still in some countries is, that the act of bringing a
prize infra praesidia, changed the property but the rule now established is,
that there must be a sentence of condemnation to effect this purpose. 1 Rob.
Adm. R. 134; 1 Kent's Com. 104; Chit. Law of Nat. 98; Ab. Sh. 14; Hugo,
Droit Romain, Sec. 90.