On the 21 April, the spearheads of the 1st Ukraine Front and the 1st White Russian Fronts met near Künigswusterhausen, encircling the three Army Corps of General de Infanterie Busses’s German Ninth Army in the Frankfurt-Fürstenwalde-Königswunsterhausen area. The Ninth Army was now being attacked on three sides. On the morning of 23 April, Hitler had given authorization to pull back the Oder Front. The surrounded Ninth Army formed up for the breakout.
Attacker: German (SS) (Remnant of SS-Panzer Aufklarungsabteilung 10, supported by Schwere SS-Panzer Abteilung 502)
Defender: Russian (Elements of the Soviet 8th Guards Army)