Graudenz) contained headquarters of the 16th Infantry Division, as well as the military Center of Cavalry Training (Centrum Wyszkolenia Kawalerii).

Grudziądz itself was defended by the Operational Group East (Grupa Operacyjna Wschód), under Gen. Mikołaj Bołtuć.

On 1 September, in the afternoon, after receiving reinforcements, the Germans continued their attack, which was finally halted by the Poles at app.

The situation of Polish troops was particularly difficult in the western wing of their line of defence, and as a result, the 66th and the 64th infantry regiments (part of the 16th I.D.)

To save the situation, General Bortnowski ordered 142nd squadron of the Polish Air Force (Colonel Bolesław Stachoń) to bomb German positions.

Panic broke out in some Polish units, as the Wehrmacht, supported by the local Fifth Column, attacked the 208th reserve infantry regiment.

Furthermore, Polish 65th infantry regiment recaptured Nicwałd, but the Poles were halted before they reached their original defensive positions along the Osa.

The Polish defenders destroyed the bridges over the Vistula and retreated to the south-east, towards the Drwęca river, where they took new defensive positions.