 Even after the English fleet began seizing Dutch ships and an attack on Dutch possessions in West Africa, he had reported in August 1664 that the Dutch would probably accept reducing their share of overseas trade in favour of England, although contemporary Dutch sources reported strengthening Dutch resistance to these provocations.Downing had been in contact with the Orangists since 1661, and believed they would collaborate with England against their republican enemies.He used Henri de Fleury de Coulan de Buat in an attempt to procure an Orangist coup in an attempt to end the war and overthrow de Witt, but de Buat's treasonable correspondence with England was discovered, leading to his rapid arrest, trial and execution.