"[My soldiers fought] in one of the biggest and most destructive battles of all times."

— Johannes Blaskowitz, Order of the 20th September
Only a few Polish units managed to break out of the encirclement.
These groups entered Warsaw and Modlin, mostly around 19 and 20 September, crossing the Kampinos Forest, and fighting German units in the area (for example, in the battle of Wólka Węglowa).
Among them were Generals Kutrzeba, Knoll-Kowacki and Tokarzewski, two cavalry brigades (Wielkopolska and Podolska) of General Abraham, and the 15th and 25th Infantry Divisions.
The remainder (4th, 14th, 17th, 26th and 27th Infantry Divisions), which didn't manage to cross the river, with General Bortnowski, capitulated between 18 and 22 September.
Polish casualties were estimated at 20,000 dead, including three generals: Franciszek Wład, Stanisław Grzmot-Skotnicki and Mikołaj Bołtuć.
German casualties are estimated at 8,000 dead.

After the battle the remaining German divisions rushed towards Warsaw and Modlin and soon encircled both.
The Bzura campaign ended in defeat for the Poles but because of the initial Polish local successes the German advance on Warsaw was halted for several days.
The Wehrmacht was required to divert units from its push towards Warsaw.
This enabled the Polish units defending Warsaw and its environs to better organize their own long-term, but ultimately failed, defense of the capital.

The campaign also showed the importance of taking initiative, proved that horse cavalry units were still an important factor on the battlefield, and proved the importance of air superiority as well as confirmed that simple numerical superiority did still matter.
"[My soldiers fought] in one of the biggest and most destructive battles of all times."
— Johannes Blaskowitz, Order of the 20th September
Only a few Polish units managed to break out of the encirclement. These groups entered Warsaw and Modlin, mostly around 19 and 20 September, crossing the Kampinos Forest, and fighting German units in the area (for example, in the battle of Wólka Węglowa). Among them were Generals Kutrzeba, Knoll-Kowacki and Tokarzewski, two cavalry brigades (Wielkopolska and Podolska) of General Abraham, and the 15th and 25th Infantry Divisions. The remainder (4th, 14th, 17th, 26th and 27th Infantry Divisions), which didn't manage to cross the river, with General Bortnowski, capitulated between 18 and 22 September. Polish casualties were estimated at 20,000 dead, including three generals: Franciszek Wład, Stanisław Grzmot-Skotnicki and Mikołaj Bołtuć. German casualties are estimated at 8,000 dead.
After the battle the remaining German divisions rushed towards Warsaw and Modlin and soon encircled both. The Bzura campaign ended in defeat for the Poles but because of the initial Polish local successes the German advance on Warsaw was halted for several days. The Wehrmacht was required to divert units from its push towards Warsaw. This enabled the Polish units defending Warsaw and its environs to better organize their own long-term, but ultimately failed, defense of the capital.
The campaign also showed the importance of taking initiative, proved that horse cavalry units were still an important factor on the battlefield, and proved the importance of air superiority as well as confirmed that simple numerical superiority did still matter.
Battle of the Bzura