Amkilsøre, while the 7th Brigade and 1st Battery got the guarding of the coastline from Stolbro Næs to Hellesøgaard Ferry. 1st Division got headquarters in Ulkebøl, Headquarters was temporarily relocated to Hørup Nederby. 3rd Cavalry Brigade guarded the coast from Hellesøgaard Ferry over Tontoft Nakke, Fynshav, Mommark to the west coast of Kegenæs, 4th Dragon Regiment 2nd Half Regiment northernmost, Gardehusarregimentet southernmost. In case of alarm, 2 squadrons were to meet south of Ketting, 2nd Half Regiment west of Hørup Church. Prussian plans On June 28, General Eberhard Herwarth von Bittenfeld published the outline for the crossing. According to this, the Manstein Division was first to be put over and take possession of Arnkil, Rønhave, and the surrounding terrain; later it was to advance towards Ulkebøl and Hørup to prevent the Danish troops from embarking. The Wintzingerode Division was to follow immediately after and be directed against Ulkebøl, 25th Brigade in front, 49th Brigade in reserve. The reserve artillery was to occupy the above mentioned positions at 1 am, and the mounted artillery was to assemble at Ragebøl. 13th Division's artillery was to be lined up at the eastern exit of Blans, available to the division commander. The boarding of the boats was to take place from 1 to 2 o' clock in the morning, and the crossing was to be made without delay. Battle The Prussian command gave orders for the crossing of the Alssund – the narrow strait separating Als from the mainland of Jutland – to begin in the night of 28–29 June 1864. The Commander-in-Chief had selected Øster Snogbæk, at the northern end of the strait, as the crossing place, the nearby Sottrup Storskov woods providing cover which enabled the preparations to be hidden from the Danes. At midnight, the Prussian troops were gathered for the assault, without packs and wearing Feldmützen (forage caps) instead of helmets. At 2:00am 2,500 Prussian soldiers started crossing the Alssund, between the village of Sottrupskov and the Sandbjerg Estate, in small boats. The Danish modern armoured monitor Rolf Krake was in Augustenborg fjord, and sailed to the Alssund where it caused the Prussians severe difficulties and stopped the crossing. But after that the Rolf Krake, due to damage including to its bridge caused by heavy Prussian shelling and the mistaken belief that Prussians had already crossed the strait south of its position, suddenly turned around and sailed away; the Prussian