In early May 1916, due to Enver Pasha's insistence, the Ottomans launched a second invasion of Persia. This was undertaken by the XIII Corps commanding roughly 25,000 troops; the Germans promised to contribute some artillery batteries, but this aid never came. On June 3, the Russians attacked the 6th Infantry Division in an attempt to encircle them at the town of Hankin. However, they were too thinly spread, and their infantry were held in check while their encircling cavalry were crushed. Ottoman casualties were light compared to the Russians: 85 killed, 276 wounded, and 68 missing. This gave the Turks valuable time to strengthen their defenses. On June 8, they crossed the border back into Persia.