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Pivoting on Sieniava, Von Mackensen swung his right toward Mosciska, which Von Marwitz captured on June 14, 1915. The same night the Archduke Joseph Ferdinand's entire army was slowly wheeling from the San toward the Tanev, facing due north. On June 16, 1915, the left of this line was already inside the borders of Russian Poland, and its right wing along the entire Tanev front.

Heavy howitzers lumbered along the way to Rawa-Ruska not to Lemberg, but to the north of it, on the flank of the Russian army still holding the Lower San. This army had therefore to retire northward to the river line of the Tanev stream, cautiously followed by the archduke's forces. The "phalanx" had again saved them from disaster.

By the 30th the Teutonic allies had swept forward beyond the Tanev region to Franpol, Zamoez, and Komarovo, and on the same evening they threw the Russians out of their strong defenses on the Zavichost-Ozarow-Sienno line, west of the Vistula. The pursuit was pushed energetically on both sides of the Kamienna. The important bridgehead on the Vistula, Josefovo, was taken on the 1st of July.

For the defense of Lemberg the front ran in a concave form from along the River Tanev, five miles from Rawa-Ruska, down to Grodek and Kolodruby; then eastward behind the Dniester to Zuravno and Halicz.

Defeats of the Russian rear guards on June 29, 1915, to the northeast and west of Tomaszow, where Teutonic forces had now also crossed into Poland, caused the Slavs to begin the relinquishment of the Tanev forest district and the lower San. Tomaszow itself was occupied by the pursuing troops.

On June 16, 1915, the Teutonic allies forced the Russians to fall back upon Tarnograd from north of Siemandria, thus pushing this section of the front across the boundary into Poland about to the line of the Tanev. Tarnograd itself was occupied by the Teutons on the 17th, and on the 18th the Russians retreated behind the Tanev.