James IV of Scotland invaded Northumberland in support of Perkin
Warbeck's claim to the English throne. However, he received less
support than expected, and soon retreated. As a result, James IV
signed the Treaty of Ayton with Henry VII and expelled Warbeck from
his court.
Citation:
Editors. "James IV of Scotland invades Northumberland in support of Perkin Warbeck".
The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=13956, accessed 20 May 2013.]