at a low level of readiness. Units were not concentrated; ammunition and other supply dumps were neither concealed nor quickly available to combat units. Compounding the problem was that Stalin strictly forbade any Red Army unit from opening fire on reconnaissance patrols, allowing the Germans to easily identify all major targets in the border districts. Furthermore, Soviet tank crews were not trained on the mechanical details of their machines. That meant that simple mechanical problems resulted in hundreds of Red Army tanks being abandoned on the road side en route to the battle. Those units that did manage to show up at their jumping off points then discovered that the supplies had either been destroyed or moved to another location without updating their locations. After receiving orders to attack and lacking fuel or ammunition, the crews responded by destroying their vehicles and retreating. Hundreds of tanks were lost in this way. Compounding these logistical difficulties was that each Red Army tank division had 300–400 tanks, but were supported by only 1500 trucks, contrasting with a Wehrmacht tank division which had only 150–200 tanks, but 2000 trucks. Experience would prove that the ratio of trucks to tanks favored by the Germans was far more effective. Balance of the tank forces On 22 June 1941, the balance of tanks over the entire area of the German Army Group South and the Soviet Southwestern Front, including but not limited to the main battle of Brody, was as follows. The figures presented above for Soviet formations are "on hand" totals for those units and do not reflect actual operational vehicle numbers. Even these apparently impressive on-hand numbers are not close to the units' authorized strengths because those organizations were still in the process of being formed and equipped at the time of the invasion. The 15th, 19th, and 22nd Mechanized Corps were only created a few months prior to the start of the war, leaving these formations unprepared, uncoordinated, ill- or untrained, and not ready for effective combat operations. Even the 4th, 8th, and 9th Mechanized Corps had been in existence less than a year at the start of the war. Soviet ill-preparedness, lack of training, and lack of fuel, ammunition, and spare parts assured that actual, operational vehicles were dramatically less in number. Even those that were operational were often not bore-sighted and therefore could not fire accurately, whether ammunition was available or