rivers, and meeting almost no resistance and with strong air support, had reached Slatina by evening, despite poor roads and bad weather. Later that day, as the situation was becoming increasingly desperate throughout the country, Dušan Simović, who was both the Prime Minister and Yugoslav Chief of the General Staff, broadcast the following message: The bulk of the 1st Army were able to cross the Danube and began to prepare defences. By the evening of 10 April, the 1st Army was ordered to withdraw from this line and form a defensive line behind the Sava from Debrc to the confluence with the Vrbas river, for which one or two days would be needed. On the night of 10/11 April, the whole 2nd Army Group continued its withdrawal, but units of the 2nd Army on the left flank of the 1st Army that included significant numbers of Croats began to dissolve due to the fifth column activities of the fascist Ustaše and their sympathisers. 11–12 April At dawn on 11 April, Hungarian forces, consisting with the Mobile, IV and V Corps of Vezérezredes (Lieutenant General) Elemér Gorondy-Novák's 3rd Army, crossed the Yugoslav border north of Osijek and near Subotica, overcame Yugoslav border guards and advanced on Subotica and Palić. The XLVI Motorised Corps continued to push east south of the Drava, with the 8th Panzer Division capturing Našice, Osijek on the Drava, and Vukovar on the Danube, followed by the 16th Motorised Infantry Division which advanced east of Našice, despite bridge demolitions and poor roads. The 8th Panzer Division had effectively routed the 2nd Army Group by 11 April. On the same day, Messerschmitt Bf 110's of I Group of the 26th Heavy Fighter Wing ( 26, ZG 26) destroyed several 1st Air Reconnaissance Group Breguet 19s at Ruma. The rest were flown to Bijeljina, but were destroyed the following day when I/ZG 26 swept over the airfield in one of the most effective attacks of the campaign. On the night of 11/12 April, the 8th Panzer Division captured Sremska Mitrovica on the Sava at 02:30, destroyed a bridge over the Danube at Bogojevo, and advanced on Lazarevac about south of Belgrade. These advances delayed the withdrawal of the 2nd Army Group south of the Sava. By 12 April, the withdrawal of the 2nd Army Group was being threatened from the left flank, with 2nd Army having "no combat importance at