Emboldened by her relatively easy victories, Japan then sought to move her defensive perimeter even further outward. She raided the Indian Ocean and drove the British fleet back to Africa's east coast. She attempted to isolate Australia and New Zealand from America by conquering the rest of New Guinea with an eye then to occupying New Caledonia, Fiji, and Samoa. This initiative was rebuffed in the Coral Sea. The following month, fatally for hopes of concluding a short war, Japan attempted to take possession of America's Midway Island. The battle cost Japan her four of the six fleet carriers that had been instrumental in her earlier successes. It was a decisive battle, but not a victory as Japan had expected. America, too, had never lost a war.