The successful Chortkiv offensive halted primarily because of a lack of arms – there were only 5–10 bullets for each Ukrainian soldier. The West Ukrainian government controlled the Drohobych oil fields with which it planned to purchase arms for the struggle, but for political and diplomatic reasons weapons and ammunition could only be sent to Ukraine through Czechoslovakia. Although the Ukrainian forces managed to push the Poles back approximately 120–150 km. they failed to secure a route to Czechoslovakia. This meant that they were unable to replenish their supply of arms and ammunition, and the resulting lack of supplies forced Hrekov to end his campaign.