Piłsudski arrived at the front near Lida on 15 April, bringing reinforcements from Warsaw. His plan called for exploitation of the gap in the Soviet lines between Vilnius and Lida by an advance towards Vilnius using the road and railway. Amidst diversionary attacks, designed to draw Russian attention away from the main Polish thrust towards Vilnius, the main Polish attack began at dawn on 16 April. The forces moving on Vilnius included the cavalry group of Colonel Wladyslaw Belina-Prazmowski, composed of 800 men in nine cavalry squadrons and a battery of horse artillery; and infantry under General Edward Rydz-Śmigły, composed of 2,500 men in three battalions of the Polish 1st Legions Infantry Division and two batteries of heavy artillery.