Saxon troops invade Livonia, which marks the start of the Great
Northern War, lasting until 1721.
Citation:
Editors. "Saxon troops invade Livonia; this marks the start of the Great Northern War".
The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16980, accessed 25 May 2013.]