The Russian right, retiring to avoid envelopment, sought the natural line of retreat along the railway to Kovno. In executing this movement it turned toward the northeast, and exceeding in speed of movement the corps to the south of it, the Twentieth, under the command of General Bulgakov, the latter was left out of the line. In consequence its right wing was turned and it was pressed down toward the south with the enemy on three sides of it. It speedily became a broken force in the forest north of Suwalki. The Russians endeavored to reach the protection of their great fortress of Grodno. It was the task of the German division coming down from the north in forced marches to cut off this way of escape and prevent the Russians coming out of the forest toward the southeast. The march of these German troops carried them through great woodlands, amid frozen lakes, when suddenly a thaw set in. The sleighs which had been used had to be abandoned and wagons requisitioned on the spot wherever possible. An officer with these troops relates that infantrymen were sent forward on wagons, and on the night following the 15th of February took Sopozkin, to the east of Augustowo, on the line of the Russian retreat, capturing the baggage of an entire Russian army corps. "The morning," he writes, "presented to us a unique picture. Hundreds of vehicles, baggage carts, machine guns, ammunition, provision and ambulance wagons stood in a vast disorder in the market place of the town and in the street. In between were hundreds of horses, some harnessed, some loose, dead Russians, dead horses, bellowing cattle, and sounding over it all the words of command of our troops endeavoring to create order in this mad mix-up, and to take care of the rich booty. Many an interesting find did we make--'mementos' which the Russians had taken with them from Prussia and which now were to find their way back." A German commander tells how, in their efforts to cut off the Russian retreat, the artillery were compelled to cross many brooks running through deep gullies, so that it was necessary frequently to lower guns and wagons by means of ropes on one side and pull them up on the other.