Although the "Kuva-yi Milliye" was regarded the first step of resistance in the liberation of Turkey, irregular warfare was abandoned later on. The militia lacked discipline and experience; they had no chance in larger open field battles against the Greeks. In September 1920, they had to face and halt the advance of a highly trained and well equipped Greek Army numbering more than 107,000 men with a force less than 15,000 on the western front. After the Grand National Assembly of Turkey was opened, the regular army was created by merging different Kuva-yi Milliye groups. Kuva-yi Milliye was ultimately dissolved towards the end of 1920. Although some units of the Kuva-yi Milliye still fought on the southern front until 1921. The First Battle of İnönü is the first war in which the standing army fought against the Greek forces.