The Treaty of Offence and Defence between the Swallows and the Amazons, also called the Alliance was written by Nancy and signed by John Walker, master of Swallow and Nancy Blackett, Amazon Pirate.

Titty said It ought to be "this month" not "the" and have the lat. and long. They always put them in all over the place. Nancy added Lat 7 Lomg. 200 and said We ought to sign it in our blood .... but pencil will do (SA10).

Although it was dated "August 1929" it is assumed to have actually been signed on 13 August 1930; see What year did Swallows and Amazons take place?.

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