The first stage of the Grunwald campaign was the gathering of all Polish–Lithuanian troops at Czerwinsk, a designated meeting point about 80 km (50 mi) from the Prussian border, where the joint army crossed the Vistula over a pontoon bridge.[46] This maneuver, which required precision and intense coordination among multi-ethnic forces, was accomplished in about a week, from 24–30 June 1410.[2] Polish soldiers from Greater Poland gathered in Poznań, and those from Lesser Poland, in Wolbórz. On 24 June 1410 Władysław II Jagiełło and Czech mercenaries arrived in Wolbórz.[1] Three days later the Polish army was already at the meeting place. The Lithuanian army marched out from Vilnius on 3 June and joined the Ruthenian regiments in Hrodna.[1] They arrived in Czerwinsk on the same day the Poles crossed the river.