Around 18,000 muskets and 143 cannons were seized. Austrian and Russian Battle flags, captured during fighting, were retaken and around 1,200 prisoners of war were released.[10] Frederick was particularly worried about the paintings and books in his palace: one of his agents reported to him that the Russians had taken some, but the murals and gilding were fine, and only a few of the marble statues knocked over. The Austrians took about 130 eleven- and twelve-year-old cadets captive, from the military school, and held them in Koenigsberg until the end of the war.