1899 treaty between the United Kingdom and Portugal
For other treaties called "Treaty of Windsor", see Treaty of Windsor.
The Treaty of Windsor was a secret colonial declaration between the United Kingdom and Portugal in 1899. It was named after the earlier Treaty of Windsor (1386) though actually signed in London on 14 October 1899 by the British Prime Minister Lord Salisbury and the Portuguese ambassador Soveral.
The 1899 declaration reaffirmed former treaties between the two countries, including those of 1642 and 1661. Great Britain agreed to defend Portuguese colonies from their "future and present" enemies. Portugal agreed to not declare neutrality officially in the forthcoming Second Boer War and to prevent Boer movement of arms and troops through Lourenço Marques and Mozambique to the Transvaal.[3]