On December 17, 1916, the Germans, after considerable artillery preparation, started a more extensive offensive movement in the vicinity of Great and Little Porsk, about twenty-one miles southeast of Kovel. After considerable fighting, lasting all afternoon, nightfall put a temporary stop to this undertaking. It was, however, renewed during the early morning hours of the following day, and as a result the Germans occupied small portions of the Russian positions. These were held against a number of Russian counterattacks made during the following days. Minor engagements also occurred on December 16, 17, and 18, 1916, near Kabarowce, northwest of Tarnopol; in the Jezupol region of the river Bystrzyca between Stanislau and the Dniester; southwest of Vale Putna in the extreme south of the Bukowina; on the Narajowka River near Herbutow, about ten miles north of Halicz; and near Augustowka south of Zboroff. During the balance of December, 1916, nothing of importance happened at any part of the eastern front, except that on December 25, 1916, the Germans violently bombarded the Russian positions in the region between Brody and Tarnopol in Galicia and farther south on the Narajowka south of Brzezany. The first few days in January, 1917, brought little change on the eastern front. Engagements between small detachments occurred daily at a number of places. None of these was of any importance. On January 23, 1917, the Germans after extensive artillery preparation launched an attack with considerable forces against the positions which the Russians had recently gained along the river Aa. Though meeting with stubborn resistance they were successful, and captured not only considerable ground, but also some 1,500 prisoners. The Russians were forced to retire about a mile and a half toward the north. During the next two days, January 24 and 25, 1917, they were forced back still farther. These gains the Germans were able to hold in the face of strong Russian counterattacks made on January 26 and 27, 1917, though they were unable to extend them. During the last four days of January, 1917, engagements along the entire front increased occasionally in number and violence. On January 28, 1917, Russian troops attacked positions held by Turkish troops near the Galician village of Potutory, some seven miles south of Brzezany. At the point of the bayonet the Turks were forced to yield, and in spite of a number of counterattacks the Russians maintained their success. Fighting on January 29, 1917, was restricted chiefly to the vicinity of the river Aa, where the Germans again made some slight gains. This was also the case on January 30, 1917, when the Germans with the assistance of extensive artillery bombardments and a series of gas attacks captured some more Russian positions as well as about 900 prisoners and fifteen machine guns.