In a classic pincer maneuver, the XL Reserve Corps from the German 8th Army was sent along the Bobr River to meet the forward elements of the 10th with the goal of trapping the majority of the our 10th (III, XX, and III Siberian Corps) in a cauldron.  While the XX Corps desperately tried to hold the German onlaught in the Augustow Forest, the fortress of Osowiec was the hinge of the Russian left flank.

You have demonstrated great valor in the battle, leading the sorrounded corps out of the cauldron and stopping the German attack.
