They spiked six 24 - pounder guns and three 18 - pounders , and blew up the magazine .
The marines captured the fort , which was only guarded by 15 men , who they took prisoner .
marines spiked six 24 - pounder guns and three 18 - pounders , and blew up the magazine .
The marines captured the fort , which was only guarded by 15 men , who they took prisoner .