The engagement on the Srka di Legen was the last on the Macedonian front before the great offensive, with the exception of a few small raids on many sectors. The British were particularly active during this period, both as regards raids in the Struma and in aerial bombardments. Whereas, until about the middle of 1917, the enemy were decidedly stronger than the Allies in the air, they had since then been steadily losing their superiority and finally found themselves in a state of absolute inferiority. The British were so constantly bringing down German machines that the enemy hardly dared any longer to appear in the air beyond their own lines. There was now considerable activity in Albania in the sector where the Armée d’Orient co-operated with the Italian 16th Corps, and on May 15, a French column, commanded by Colonel Caré, composed of the 58th Battalion of Chasseurs à pied, 10 platoons of Albanian Gendarmerie, a battalion of the 372nd Infantry Regiment, 3 mountain batteries, and a regiment of Moroccan Spahis, plus a reserve of 7 Colonial companies, took the offensive between the junction of the Kelizoni and the Devoli and the height of Mali Korori (south-west of Moschopolje); an Italian column was to deliver an attack at the same time from the line of the Osum, near Cerevoda. The object of the Allies was to reduce the strong enemy salient formed as a result of the French attack at Pogradetz, which penetrated wedge-like between the positions then captured and the Italian positions to the north and north-west of the Ersek road, menacing the Santi Quaranta road between Ersek and Koritza. The two attacks met with vigorous resistance, especially at the extreme left of the Italians and the extreme right of the French; both the Italians and the French captured some positions, lost them, and recaptured them definitely. Towards the centre the resistance was weaker. On the 17th the liaison between the two forces was realized at Backa, according to plan. Mount Lesetz alone (east of Protopapa and south of the Devoli) could not be captured by the French. A definite result was the elimination of the enemy salient, the reduction of the French and Italian front by about 40 kilometres, and the occupation of the numerous villages contained in the salient itself. The new lines went from the junction of the Devoli and the Kelizoni, passing by Tchafa Becit, Maya Frenkut, Backa to Cerevoda. Thus the Santi Quaranta road was now safe. The enemy made no attempt at a counter-offensive, save for artillery fire, and the Italians and French were able to reinforce the new lines unmolested.