Army Detachment Steiner (German: Armeeabteilung Steiner), also referred to as Army Group Steiner: 12  (German: Armeegruppe Steiner) or Group Steiner (German: Gruppe Steiner), was a temporary military unit (Armeegruppe-type), mid-way in strength between a corps and an army, created on paper by Adolf Hitler on 21 April 1945 during the Battle of Berlin, and placed under the command of SS-Obergruppenführer Felix Steiner.
 Hitler hoped that the units assigned to Steiner would be able to stage an effective counterattack against the northern pincer of the Soviet assault on Berlin, but Steiner refused to attack upon realizing the units were inadequate, being made up of some soldiers, Hitler Youth teenagers, emergency Luftwaffe ground personnel, and Kriegsmarine dockworkers. The only tanks available were approximately a dozen captured French tanks from 1940. It was the failure of this offensive that led Hitler to admit out loud for the first time that Germany had lost the war.
 On the second day of the Battle of Berlin, 17 April, Generaloberst Gotthard Heinrici, the Commander-in-Chief of Army Group Vistula, stripped Steiner's III (Germanic) SS Panzer Corps (the army group's reserve) of its two strongest divisions, the 11th SS Volunteer Panzergrenadier Division Nordland and the 23rd SS Volunteer Panzergrenadier Division Nederland. He placed them under the command of General der Infanterie Theodor Busse, commander of the 9th Army, as Busse had most of the other units in the III Corps. The Nordland division was sent to join Helmuth Weidling's LVI Panzer Corps defending the Seelow Heights, to stiffen the sector held by the 9th Parachute Division. The Nederland Division was sent south-west of Frankfurt (Oder) and assigned to the V SS Mountain Corps, where it would later be destroyed in the Battle of Halbe.
 Heinrici ordered the III SS Panzer Corps, reduced to three battalions and a few tanks, to scrape together whatever forces it could find to set up a screening line along the Finow Canal to protect the southern flank of the Third Panzer Army from an attack by Soviet Marshal Georgy Zhukov's 1st Belorussian Front, which had broken through the Seelow Heights' defences and was encircling Berlin.
 By 21 April Adolf Hitler, ignoring the facts, started to call the ragtag units that came under Steiner's command "Army Detachment Steiner". He ordered Steiner to attack the northern flank of the huge salient created by the 1st Belorussian Front's breakout. Simultaneously the 9th Army, which had been pushed south of the salient, was to attack north in a pincer attack. To facilitate this attack Steiner was assigned the three divisions of the 9th Army's CI Army Corps, the 4th SS Polizei Panzergrenadier Division, the 5th Jäger Division, the 25th Panzergrenadier Division — all were north of the Finow Canal — and Weidling's LVI Panzer Corps, which was still east of Berlin with its northern flank just below Werneuchen.
 The three divisions to the north were to attack south from Eberswalde (on the Finow Canal and 24 km (15 miles) east of Berlin) towards the LVI Panzer Corps, so cutting the 1st Belorussian Front's salient in two. Steiner called Heinrici and informed him that the plan could not be implemented because the 5th Jäger Division and the 25th Panzergrenadier Division were deployed defensively and could not be redeployed until the 2nd Marine Division arrived from the coast to relieve them. This left only two battalions of the 4th SS Division available, and they had only pistols and submachine guns with no heavy weapons. Heinrici called Hans Krebs, Chief of the German General Staff of (OKH), told him that the plan could not be implemented and asked to speak to Hitler, but was told Hitler was too busy to take his call.
 When, on 22 April, at his afternoon conference Hitler learned that Steiner was not going to attack, according to testimony of his secretary, he was "silent for a long time", and then insisted that the women (she and Braun) should leave Berlin immediately (but they refused). He declared that the war was lost, blamed the generals and announced that he would rather stay in Berlin until the end and then kill himself. After 22 April "Army Detachment Steiner" was little mentioned in the Führerbunker.
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