sentences:  The east–west portion of the line that ran from Ostrava to Opava which is a river valley with a steep rise to the south, became the scene of intense fighting.It is unknown how vital those fortifications were to German defense, but after hurried patching of some buildings leaving holes for machine-gun nests they were used against the Soviet advance from 17 to 26 April 1945.During World War II the Germans had removed many armored parts like domes, cupolas and embrasures from the majority of the objects.