Ever since Britain had wrested control of the Cape Colony from the Netherlands during the Napoleonic Wars, it had co-existed with Dutch settlers who had migrated further away from the Cape and created two republics of their own. The British imperial vision called for control over these new countries, and the Dutch-speaking "Boers" (or "Afrikaners") fought back in the War in 1899–1902. Outgunned by a mighty empire, the Boers waged a guerrilla war (which certain other British territories would later employ to attain independence). This gave the British troops a difficult fight, but their weight of numbers, superior equipment and often brutal tactics, eventually brought about a British victory. The war had been costly in human rights and was widely criticised by Liberals in Britain and worldwide. However, the United States gave London its support. The Boer republics were merged with Cape Colony and Natal into the Union of South Africa in 1910; this had internal self-government, but its foreign policy was controlled by London and it was an integral part of the British Empire.