 The 2nd Tank Army was to be protected on the right flank by a cavalry corps (the 2nd Guards) and the 47th Army, however it reached the region east of Warsaw on 29 July, before the slower 47th Army could provide support; the 47th Army and the 2nd Guards were engaged in the battle around Siedlce, 50 kilometres to the east.Germans counterattacked, in what became known as the Battle of Radzymin, with two panzer corps (XXXIX and IV SS).On 29 July, Radzievsky ordered his 8th Guards Tank Corps (under Lieutenant General A. F. Popov) and 3rd Tank Corps (under Major General N. D. Vedeneev) to advance northward (northeast of Warsaw) aiming to turn the German defenders' left flank, as the 16th Tank Corps engaged the Germans southeast of Warsaw.