In the Cologne War over the religious identity of the electorate,
the city of Bonn had been captured for the Protestant cause the
previous December. However, now it is recaptured by a Spanish force
campaigning on behalf of the Catholics.
Citation:
Editors. "A Spanish force recaptures Bonn from John Casimir".
The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15380, accessed 19 May 2013.]