Instead of Vernon concentrating his next attack on Havana as expected , in order to conquer Cuba , he planned to attack Cartagena de Indias .
The extreme ease with which the British destroyed Porto Bello led to a change in British plans .
Instead of Vernon concentrating Porto Bello 's next attack on Havana as expected , in order to conquer Cuba , Porto Bello planned to attack Cartagena de Indias .
The extreme ease with which the British destroyed Porto Bello led to a change in British plans .