Domen
Misico dux Vandalorum
How much did Stalin have to do with the Red Army's defeat at Warsaw in 1920? IIRC he
was Tukhachevskii's political officer or some such.
Stalin in 1920 was head of the Revolutionary War Council of the South-Western Front - and de facto he was in charge of this Front.
The South-Western Front was not the one which fought in the battle of Warsaw - it was attacking on the direction Lviv - Cracow.
However, on 13 August 1920 Commander in Chief of the Red Army - Sergey Kamenev - issued an order No 4774/op/1052, in which he ordered the South-Western Front to support the weak and exposed southernmost flank of the Western Front - which was protected only by the Mozyr Group (under Tikhon Khvesin), operating south of the 16th Army of this Front.
According to this order the South-Western Front should have advanced with its two northernmost armies - 12th Army and 1st Cavalry Army (Semyon Budyonny) - in north-western direction, in order to support the Mozyr Group against a possible Polish attack. He also ordered sending reinforcements to the Western Front, in order to capture Warsaw as fast as possible.
Stalin, however, refused to carry out this order and substantiated his refusal in a telegram No 13820 sent to Kamenev on 14 August.
As the result of Stalin's refusal, northern wing could not help the Mozyr Group until 20 August 1920, when the Soviet unsuccessful assaults of Lviv were halted and the 1st Cavalry Army was finally sent towards Zamosc in order to help the Western Front.
But on 20 August, the Western Front - and especially the overextended Mozyr Group on its southern flank - was already in tatters (the Polish counteroffensive started on 13 August and by 25 August the Western Front was completely annihilated). Moreover - the 1st Cavalry Army, unsupported by the 12th Army, was nevertheless defeated in combats near Zamosc by 29 August.
On 1 September Joseph Stalin's "request for his discharge from military service" was accepted by the Politburo.