The Spanish seized Fort Saint - Elme through the treason of its commander .
The Spanish captured the port of Collioure on 20 December , wiping out 4,000 of its garrison of 5,000 men .
The Spanish seized Fort Saint - Elme through the treason of its commander and captured the port of Collioure on 20 December , wiping out 4,000 of its garrison of 5,000 men .