The archduke's front was smashed at Rudnik early in June, 1915; his forces were driven back a day's march and lost 4,000 men in prisoners, besides many guns. The Second, Third and Fourth Tyrolese regiments were almost annihilated. German troops were hurried to the rescue. Boehm-Ermolli also got into serious difficulties at Mosciska, where the Russians held him up for a week with a furious battle. Ivanoff was scoring points against all his individual opponents excepting only Von Mackensen. The "phalanx," always kept up to full strength by a continuous influx of reserves and provided with millions of high-explosive shells, not only pursued its irresistible course eastward, but had to turn now right, now left, to help Austrian and German commanders out of trouble. 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. Similarly, at Mosciska, when Boehm-Ermolli tried to storm the Russian position by mass attacks, his infantry was driven back with such terrible punishment that they could not be induced to make another advance. There was nothing to be done here, but wait till Von Mackensen turned the flank of the Russian position for them, which he did in one of the most stubborn conflicts of the war--the battle of the Lubaczovka, a tributary of the San between Rawa-Ruska and Lemberg. Never were the fighting abilities of Slav and Teuton more severely tested. For over a week the struggle raged; a half million men were brought up in groups and flung against the Russian front. Shell, shrapnel, bullets and asphyxiating bombs finally wore down the Russian resistance.