 After some negotiation followed by a brief resumption of the bombardment , the Batavian commander surrendered . The garrison of 679 troops were taken prisoner and more than 100 cannon seized by the British . British losses in the brief campaign amounted to 16 killed and 60 wounded . Following the fall of Trincomalee , nearby Fort Oostenberg was summoned to surrender on 27 August . Four days later the commander turned his position over to the British under the same terms offered to the garrison of Trincomalee . With resistance broken , Batavian trading posts along the Ceylon coastline surrendered in quick succession , Batticaloa to the 22nd Regiment of Foot on 18 September , Jaffna to Stuart directly on 27 September after a landing in force , Mullaitivu to a detachment of troops from 52nd Regiment of Foot in HMS Hobart on 1 October and the island of Mannar on 5 October . 
