Three and a half centuries ago Cartagena de Indias was renowned as the richest trading center and most beautiful city on the Spanish Main. It was the principal emporium for merchandise sent from Spain to its South American colonies and the shipping point for gold, silver, emeralds, and pearls mined in Colombia and Venezuela. Between 1544 and 1741 Spain’s enemies sacked the town five times.
Built on a narrow, low strip of land between the open Caribbean Sea to the north and a huge bay behind, Cartagena was hard to defend. The marshy soil made poor footing for the heavy stone fortifications required in the tropics, and in any case there was no stone to build them with. The only harbor entrance was miles to the south.
Lack of landing beaches, heavy surf, and shallow water that kept bombarding ships at a distance combined to make the direct northern approach quite secure. The back door, however, presented problems beyond the capacities of seventeenth-century weapons and tactics. Once inside the bay an attacker could easily close in from the south.