A heavy thaw made movement of troops anywhere except on the main roads extremely difficult. Guns were left stuck in the mud, and the infantry waded to the knee in water, and sometimes to the waist. It is reported that one of the horses of the artillery literally was drowned on the road. Germans attacked Tauroggen, where the enemy had intrenched himself, under an artillery fire directed from the church tower of the place. On the 28th the town was taken, after a difficult crossing of the Jura River in front of it, on the ice. The Germans then exulted in the fact that not a Russian was left on German soil. * * * * * CHAPTER XLII GERMAN INVASION OF COURLAND--CAPTURE OF LIBAU On the 20th of April, 1915, an announcement was made by the German Great Headquarters which took the Russians and the world in general more or less by surprise. It gave the first glimpse to the public of a group of operations which caused no little speculation in the minds of strategists. It read: "The advance troops of our forces operating in northwestern Russia yesterday reached on a broad front the railway running from Dunaburg (Dvinsk) to Libau. Thus far the Russian troops present in that region, including also the remnants of those which took part in the raid against Memel, have attempted no serious resistance anywhere. Fighting is now in progress near Shavli." The advance into Courland here announced had been made by the German troops at high speed. The forces were under the command of General von Lauenstein. They had begun to move early on the 27th of April, in three columns. One of these crossed the Niemen at Schmalleningken, forming the right wing of the troops engaged in the movement. The columns of the left wing broke out of East Prussia at its northernmost point, and moved along the dunes of the Baltic. On the second day of the forward march it was learned by the leaders of the advancing troops that the Russians had hastily left their position at Skawdwile, on the main road from Tilsit to Mitau, to escape being surrounded on their left flank, and had withdrawn to Shavli by way of Heilmy. On the third day the German right column crossed the Windawski Canal under the enemy's fire, and on the afternoon of the 30th of April this column entered Shavli, which had been set on fire by the Russians. [Illustration: GERMAN ADVANCE ON RIGA]