when the Serres Division managed to make limited gains on the flanks having suffered numerous casualties and lost momentum. In the meantime the 22nd British Division overtook two central trenchlines. Supported by concentrated artillery and machine gun fire the 3rd Bulgarian Brigade pushed the Allies back, by the end of the day the sum of the Entente forces were back at their starting point, the British 67th Brigade having lost 65 percent of its soldiers. The offensive was resumed at 4.00 a.m. on 19 September after a night of heavy shelling. The operation involved the British 77th and 65th Brigades, the French 2/2nd Zouaves regiment. along with the Serres and 14th Greek Divisions. Following five hours of intense fighting the Allies managed to overrun the town of Dojran, mount Kala Tepe and Teton Hill, with the Pip Ridge and mount Dub remaining in Bulgarian hands. In the aftermath of the engagement the Allied command found itself to be unable to make any further offensive operations on the Doiran sector as it no longer possessed an adequate reserve of manpower. Bulgaria lost a total of 518 dead, 998 wounded, and 1,210 captured. Greek casualties amounted to 503 killed, 2,286 injured and 615 missing, with the British suffering 3,871 dead and wounded. Subsequent operations On 20 September, the 17th and 122nd French Colonial Divisions along with the 1st Serbian Army crossed river Crna. News of a breakthrough at Dobro Pole prompted the defenders of Doiran to abandon their positions and rush to the defense of their homeland, in order to prevent a future occupation by the Entente. On 21 September, the Allies became aware of the Bulgarian withdrawal after observing a series of fires and munition dump explosions on the Bulgarian positions, a pursuit by the British XII Corps was launched immediately. The Serbian advanced guard approached Krivolak, thus creating a wedge between the 1st Bulgarian and 11th German Armies in an effort to force the latter to retire towards Albania. The 2nd Bulgarian Army headed towards the Kosturino Pass avoiding direct engagement with the Allies. At 17:30 p.m. on 22 September, the Italian 35th Division under General Ernesto Mombelli joined the offensive, seizing Hill 1050 stronghold from the 302nd German Division and taking 150 prisoners. Fighting took place in Kanatlarci and along the Monastir–Prilep road, in Cepik, Kalabak and Topolčani as the Allies continued to advance towards Prilep. At 14:00 p.m.