The following day, the Soviet units continued their advance towards Zamość, but found the Polish mobile defence difficult to break. The garrison of the fortress was composed of a number of units commanded by Captain Mikołaj Bołtuć. Among them were the remnants of Ukrainian 6th Infantry Division under Colonel Marko Bezruchko, one regiment and two battalions of Polish infantry, three armoured trains and a number of smaller units, some 700 bayonets and 150 sabres altogether. At the same time, the Polish 1st Cavalry Division moved to the villages of Wolica Brzozowa and Komarów, to the west of the city.