Just came across the
Siege of Madgeburg in a question on TV's Mastermind. 25,000 slaughtered by Catholic Troops.
Things don't change do they ?
http://www.filbrun.com/history/magdeburg.htm
Quote from link :-
Count Tilly, a Bavarian, commanded the army of the Catholic League during the first half of The Thirty Years War. On May 20, 1631, he and Count Pappenheim stormed Magdeburg, a prominent city in north central Germany that dated back to at least the 9th century. The Protestant city was weakened by being under siege from imperial forces of the Holy Roman Empire since the previous year.
Tilly’s army was so enraged at the lengthy resistance provided by the Magdeburgers that they put the garrisons of the city to the sword. They then sacked Magdeburg and massacred the population. Twenty-five thousand people (85% of the population!) perished.