Initially the army consisted of two improvised mountain brigades and a number of smaller units, but later in the course of war (on September 6) it was joined by forces of the withdrawing
Armia Kraków, and renamed
Armia Małopolska. From 11 September 1939, it was commanded by General
Kazimierz Sosnkowski (after General Fabrycy was reassigned to command the Polish Southern Front). On September 1 in the morning, Karpaty Army was attacked in the area of
Czorsztyn by the
4th Light Division of the
Wehrmacht, supported by the
2nd Mountain Division. Backed by the Slovakian units (see
Slovak invasion of Poland), the German divisions managed to break through Polish positions near
Tymbark and
Limanowa, causing a gap between Karpaty Army and the retreating Kraków Army. As a result, Polish headquarters agreed for a withdrawal. In the first days of the invasion, Karpaty Army lacked reserve units, as its main forces, the
24th and
11th Infantry Divisions, were either still mobilized, or were on their way towards the area of
Tarnów. The Army took heavy casualties retreating through the
San river and was destroyed during the
Battle of Lwów on September 20. ==Organization==