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In page Henry Laurens:

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In the fall of 1779, Congress named Laurens their minister to the Dutch Republic. In early 1780, he took up that post and successfully negotiated Dutch support for the war. On his return voyage to Amsterdam that fall, the Royal Navy frigate Vestal intercepted the ship he was travelling on, the Continental packet boat Mercury,[3] off the banks of Newfoundland. Although his dispatches were tossed in the water, they were retrieved by the British, who discovered the draft of a planned American-Dutch treaty prepared in Aix-la-Chapelle in 1778 by William Lee and the Amsterdam banker Jean de Neufville.[4] This prompted Britain to declare war on the Dutch Republic, initiating the Fourth Anglo-Dutch War.[citation needed]