Skirmishes between the Turkish revolutionaries and Armenian border troops in Olti took place during the summer of 1920. In the autumn of that year four Turkish divisions under the command of General Kâzım Karabekir invaded the Armenian Republic, triggering the Turkish-Armenian War. Kars had been fortified to withstand a lengthy siege but, to the astonishment of all, was taken with little resistance by Turkish forces on 30 October 1920, in what some modern scholars have called one of the worst military fiascoes in Armenian history. The terms of the Treaty of Alexandropol, signed by the representatives of Armenia and Turkey on 2 December 1920, forced Armenia to give back all the Ottoman territories granted to it in the Treaty of Sèvres.