Generally, one small bell would be left in a bell tower to ring in emergencies. Bells typically were marked with identifying information. The Dutch marked their most valuable bells with the letter “M” and posted signs in their bell towers in Dutch,French, English and German declaring their bells’ monument status. Of the approximately 9,000 bells in the Netherlands before the war, an estimated 6,500 were seized, with approximately 1,840 returned after the war.