Editors. "Count Tilly invades Saxony with 20 000 Imperialist troops". The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=16026, accessed 19 May 2013.]
Count Tilly, commander of Ferdinand II's imperial armies, invades Saxony. He is able to do this, which would previously have been out of the capabilities of the imperial forces, because he now has the additional resource of 20 000 troops recently freed up by the end of the Mantuan War from their previous post in Italy.