sentences:  With the rise of Hitler and his demands for unification of German minorities, including the Sudeten Germans, and return of other claimed territories—Sudetenland—the alarmed Czechoslovak leadership began defensive plans.While some basic defensive structures were built early on, it was not until after conferences with French military on their design that a full scale effort began.A change in the design philosophy was noticeable in the "pillboxes" and larger blockhouses similar to the French Maginot line when the massive construction program began in 1936.