It must be an error per fort ("small fort, advanced").
It means strength, strong. Type of special military construction for defense . Type of military construction designed to defend against enemy attack.
Fortin: Measure for aggregates used in Izmir that contains 4 quilotes.
FORTS had A LOS long and LO bandwidth in the country, place where SE ALISTABA EL EJERCITO or soldiers, against the MALÓNES Indians that POBLARON our country...Argentina!!!!