What is the poem Dark August by Derek Walcott about?

Derek Walcott's poem "Dark August" expresses the speaker's grief and despair at the assassination of Haitian revolutionary martyr Charlemagne Péralte during the Haitian revolution. It portrays the atmosphere of fear and oppression that characterized Haiti's political climate at the time. The speaker reflects on this dark period in Haiti's history, the struggles of the Haitian people, and the enduring spirit of resistance and revolution that Péralte embodied.