Eventually the tanks broke through the Polish line and eliminated all the bunkers one by one.

The bunker was located on a hill in the exact centre of the Polish lines.

Some successfully withdrew and reached the Polish lines, others were taken prisoner.

The Germans now had a large, covert force of saboteurs deep behind Polish lines.

It was not until 1919 that he finally crossed the Polish lines.

In the evening it became clear that the Polish lines would not be able to hold out for much longer.

Behind Polish lines, the Soviet forces hanged suspected enemies on the spot.

The Polish line currently has a fleet of 45 Soviet-made planes.

German forces had breached main Polish defensive lines protecting Silesia.

Only twelve Polish soldiers returned to the Polish lines to recount what had happened during the battle.