Editors. "Treaty of Windsor: Portugal undertakes to assist Britain in Transvaal". The Literary Encyclopedia. First published 30 December 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=19295, accessed 10 December 2013.]
Britain and Portugal sign a secret Treaty of Windsor. By the terms of this agreement, Britain promises to protect Portugal's hold over its colonies, while the Portuguese promise to aid the British in their war against the Boers by obstructing the passage of munitions from Delagoa Bay to the Transvaal.