Out of touch with the situation at the front due to Polish radio jamming, Tukhachevsky ordered Sollogub to create a defensive line between Radzymin and Brest-Litovsk with his southern divisions to prevent Polish troops from attacking the Soviet rear. For this purpose, the army's commander was given permission to draw on the 60,000 replacements near Grodno. Sollogub issued the orders on August 19, when army headquarters had lost contact with all of its units, so they were not received. Early on the next day, he was almost captured by Feliks Jaworski's Polish cavalry brigade at his headquarters in Ostrożany. By this time, most of the army had fled across the Bug towards Białystok, with only the 27th Division holding a couple of crossings to allow stragglers to pass through.