 Beevor has suggested that the rivalry went further than just jokes and says that Chuikov deliberately ordered the left flank of the 8th Guards Army (of 1st Belorussian Front) across the front of the 3rd Guards Tank Army (of the 1st Ukrainian Front), blocking its direct path to the Reichstag.As Chuikov did not inform Rybalko, commander of the 3rd Guards Tank Army, that the 8th was doing this, the troops ordered to carry out this manoeuvre suffered disproportionate casualties from friendly fire.In the south-west, Rybalko's 3rd Guards Tank Army, supported by Lieutenant-General Luchinsky's 28th Army, were advancing through the wooded park and suburbs of the Grunewald, attacking what remained of the XVIII "Panzergrenadier" Division on their eastern flank and entering Charlottenburg.