Editors. "Frederick the Great besieges Olmütz but fails". The Literary Encyclopedia. First published 30 December 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17722, accessed 21 April 2014.]
Frederick the Great begins to besiege Olmütz (present-day Olomouc, in the Czech Republic), but after facing unexpectedly strong resistance, he is eventually forced to abandon the attempt.