On 16 September 1991, the JNA mobilized in Montenegro citing the deteriorating situation in Croatia. Despite a radio broadcast appeal by the JNA 2nd Titograd Corps on 17 September, considerable numbers of reservists refused to respond to the call-up. On 18 September, Đukanović threatened harsh punishment of deserters and those refusing to respond to the mobilization. The mobilization and propaganda were in contrast with assurances from the Yugoslav federal authorities in Belgrade that there would be no attack against Dubrovnik. The JNA's strategic plan to defeat Croatia included an offensive to cut off the southernmost parts of Croatia, including Dubrovnik, from the rest of the country.