NAREW, BATTLES OF THE. The battles on the river Narew, north-east of Warsaw, in July and Aug. 1915, were a part of the great offensive planned by Falkenhayn against Russia. During May and June, Mackensen had driven the Russian armies in Galicia from Tarnow on the Dunajec to the east of Lemberg (see DUNAJEC SAN; LEMBERG). In July the group of armies un der his command was directed north-east towards Brest-Litovsk against the communications of the Russian forces which still held the Warsaw salient (see BREST-LITOVSK). Hindenburg, who com manded the group of armies on the northern part of the Eastern Front, was now ordered to strike a blow on the north side of the salient. Falkenhayn hoped thus by driving in the flanks of the salient to cut off large numbers of Russians in its apex about Warsaw. The realization of this hope depended, of course, on the rapidity with which the flanks could be forced.
A formidable water barrier protects Russian Poland against invasion from East Prussia, formed by the Niemen, the Bobr, the Narew and the lower course of the Bug, and thence the Vis tula to the frontier. The Russians had fortified this river line.
Besides the fortresses of Kovno and Grodno, Osoweic, Lomza and Nowa-Georgiewsk, there were fortified bridge-heads on the Narew at Ostroleka, Rozan, Pultusk and Zegrze. Though the river was fordable in the summer at many points, marshes along its length increased its effectiveness as an obstacle.
The tactical details of the fighting are not of any special in terest. On July 13 Gallwitz delivered his first attack on the approximate line Przasnysz-CiechanOw, aiming at Pultusk. The Russians, over-weighted both in numbers and heavy artillery, at once fell back more than half-way to the Narew line. They were attacked again on July 15, and during July 18 and 19 withdrew across the river, the Russian XII. Army on their right conforming to the movement. Reinforcements had now arrived and resistance stiffened. Though the Germans stormed the bridge-heads of Pul tusk and Rozan on July 23, and secured crossings over the river, their further progress was limited by violent Russian counter-at tacks, and they were unable to reach the line WyszkOw-Ostrow (on the lower Bug), at which they were aiming. An attempt to force a passage further east at Ostroleka on July 3o failed, and it was not until Aug. 4 that this bridge-head fell. Losses were heavy on both sides; but the Russians had secured time and space sufficient to evacuate the Warsaw salient without danger.
Hindenburg and Ludendorff naturally claimed that the result of the battle vindicated their opinion on the mistaken strategy of the Supreme Command. Falkenhayn retorted that the opera tions would have had the desired effect of intercepting the Russian retreat had Hindenburg used the full force available and given Gallwitz 20 divisions instead of 14. It seems doubtful, however, whether the communications would have allowed the effective employment of so large a force.