The World War I German Narew offensive followed after the minor success in the Second battle of Przasnysz. In stubborn battles, the Imperial German army forced the numerically superior forces of the Russian Army to retreat, but could not inflict a decisive defeat on them.
^Sanitaetsbericht ueber das Deutsche Heer (Deutsche Feld-und Besatzungsheer) im Weltkriege 1914/18. Bd. III. p. 45
^С.Г. Нелипович, Русский фронт Первой мировой войны. Потери сторон 1915, 2022, p. 531