The same military science that was used against other ethnic groups in Africa - was also used against the French, British, and Spanish during the Haitian revolution.
Yes - there were other ethnic groups involved in the Haitian Revolution, but the Dahomey was the dominant group in the rebellion.
Dessalines was raised by a Dahomey woman and she was given a state funeral when she died in 1804.
In fact - the Dahomey king sent soldiers to Haiti under the administration of King Henri Christophe.
Christophe was a great believer in discipline. He brought African warriors from Dahomey (present-day Benin), whom he dubbed Royal Dahomets. They served as the primary agents of his authority. Incorruptible and intensely loyal to Christophe, the Dahomets brought order to the countryside.
Many people were dissatisfied with the strictness of Christophe's regime. As productivity and export levels rose, however, the quality of their lives improved in comparison with revolutionary and immediately post-revolutionary days.