The military alliance began poorly. French Admiral d'Estaing sailed to North America with a fleet in 1778, and began a joint effort with American General John Sullivan to capture a British outpost at Newport, Rhode Island. D'Estaing broke off the operation to confront a British fleet, and then, despite pleas from Sullivan and Lafayette, sailed away to Boston for repairs. Without naval support, the plan collapsed, and American forces under Sullivan had to conduct a fighting retreat alone. American outrage was widespread, and several French sailors were killed in anti-French riots. D'Estaing's actions in a disastrous siege at Savannah, Georgia further undermined Franco-American relations.