to put an end to chamberlain 's peace-making efforts once and for all , hitler demanded the sudetenland be ceded to germany no later than 28 september 1938 with no negotiations between prague and berlin and no international commission to oversee the transfer ; no plebiscites to be held in the transferred districts until after the transfer ; and for good measure , that germany would not forsake war as an option until all the claims against czechoslovakia by poland and hungary had been satisfied .