The Polish Army at Kraków and Małopolska suffered heavy losses, and did not reach the San river front.

After breaking through the Polish line in the Battle of Wizna, the German XIX Army Corps under General Heinz Guderian started its rapid advance south.

However, on 14 September, they were stopped in the area of Brześć Fortress and Kobryn by a four-battalion-strong improvised force under General Konstanty Plisowski.

The simultaneous attack on Kobryn, which is sometimes referred to as the Battle of Kobryń, was inconclusive, with the Polish improvised 'Kobryń' Infantry Division under Colonel Adam Epler withdrawing unopposed.

The unit, commanded by General Ludwik Kmicic-Skrzyński, successfully evaded encirclement by withdrawing through the Białowieża Forest.

After a battle with Red Army forces, General Kleeberg decided to march to the relief of Warsaw on 22 September.

On the last day of these attacks, General Kleeberg received information that Włodawa had been captured by unknown Polish units.

Elsewhere, between 17 and 26 September, formations of the Polesie Group crossed the Bug river and entered an area near Włodawa.

General Podhorski agreed but then decided that he would first go to Stawy near Dęblin, the location of the main arsenal of the Polish army.

The following day, forces from the 'Polesie' Group passed the Świderki colonies of Bystrzyca, Wola Osowińska, Bełcząc and Ostrówek.

The command element of 5th Uhlan Regiment, and the 'Olek' and 'Wilk' infantry battalions attacked the Germans in Kock and captured the town.

On 30 September, the commander of 10th Army, Walter von Reichenau, ordered his staff to plan the destruction of a large Polish force which was located between the Bug and Vistula rivers.

General Gustav Anton von Wietersheim, the commander of the XIV Motorized Corps, knew that Polish forces were situated in the forests northwest of Kock.

The commander of the 13th Motorized Infantry Division, Generalleutnant Paul Otto [de], was of the opinion that the Polish forces had become so demoralized that they were incapable of combat, and that a single German battalion would be enough to disarm the Poles and take them to a prisoner of war camp.

This led to the beginning of a chaotic action between the Germans and Uhlans from the 'Pils' Cavalry Brigade, (commanded by Colonel Plisowski).

He decided that the 33rd Motorized Infantry Regiment supported by part of the divisional artillery would attack Annopol, Pieńki and Talczyn.

The 93rd Motorized Infantry Regiment was ordered to capture Serokomla, and then Hordzież, and to destroy a defensive formation of the 'Zaza' cavalry division.

The 93rd Motorized Infantry Regiment began an attack on the 'Wilk' battalion positions, inflicting heavy losses.

General Otto ordered the 93rd Motorized Infantry Regiment to move from the Wieprz river to Dęblin.

He thought there was a chance to destroy the 13th Motorized Infantry Division as they had already sustained heavy casualties and materiel losses.

About 11 hours apart, first from the west and then the east, forces from the 66th Motorized Infantry Regiment attacked the 'Olek' and 'Wilk' battalions who were defending Czarna.

The defenders sustained heavy casualties from artillery fire and 'Wilk' was forced to withdraw to the eastern edge of the Adamów forest.

The 3rd and 4th Squadrons, with elements of the 10th Uhlan Regiment fought near the Turzystwo village cemetery and the church in Wola Gułowska.

Ground was lost and regained repeatedly until an attack by the 2nd Battalion, 184th Infantry Regiment and the Uhlan Squadron enabled the Polish to dig in.

The commander ordered his force to re-take Wojcieszków and Glinne, which they did, but they withdrew after taking heavy losses.

The 2nd battalion of the 183rd Infantry Regiment, with artillery support, began an assault with the bayonet on the Germans who had attacked the southern wing of the 'Pils' cavalry brigade.

The rear of the southern wing of the 13th Motorized Infantry Division was attacked by the 'Edward' cavalry brigade, they captured the village of Poznań, including a German artillery battery (which had to be destroyed when the cavalry were forced to withdraw due to them coming under fire from another German artillery battery).

At 20:40, Lieutenant Colonels Kazimierz Gorzkowski and Tadeusz Śmigielski left to establish contact with the command staff of the 13th Motorized Infantry Division.

They made contact with the Germans near Adamów, and both sides agreed to a ceasefire lasting until 6 October (the next day) at 06:00, before which time a surrender was to be concluded.

In his last order, General Kleeberg wrote that the reason for his decision to capitulate was that they were surrounded and ammunition and food were depleted.