There were also street battles in Berlin during the revolutions of 1848. The Polish National Committee was convened a few days later on 20 March. Armed struggle against Prussia was not even considered at first. As the new regime in Berlin was planning to go to war with Russia, Poles in the Prussian partition were required to form an armed corps to fight alongside allied Prussian detachments. However, the regime soon changed once more and the plans for war with Russia failed to eventuate. This made it necessary to think about disarming the detachments already formed in the Grand Duchy of Poznań. The specific means adopted were to promise Poles greater autonomy (this was termed “reorganisation”), and hold talks on the topic, while simultaneously preparing to pacify the region.
The Polish side took the Prussian administration at their word. Soldiers assembled in camps in Wielkopolska to analyse the future principles of Polish-Prussian cooperation and fraternity. On 11 April 1848, the Poles were forced to conclude an agreement in Jarosławiec, near Środa Wielkopolska, whose terms were that unless the number of soldiers in the camps was reduced, the army would attack immediately.
Hostilities commenced on 29 April when Prussian detachments attacked, defeated and pacified the Polish camp in Książ Wielkopolski. The next day, Ludwik Mierosławski gathered the forces of the remaining camps and was victorious at the battle of Miłosław. On 2 May, the Prussian detachment in Sokołowo, Września County, was defeated. There was, however, no point in continuing with armed struggle. Outside assistance was not an option and the issue of the autonomy of the Grand Duchy of Poznań had been shelved indefinitely. The capitulation was signed in Bardo, Września County, on 9 May 1848.