Short answers, pulled from the story.
Operation Spring Awakening was the last major German offensive on the Eastern Front of World War II that began in early March 1945. The offensive units started their attack at 04:00 on the 6th of March 1945 while other elements attacked later that day.
Adolf Hitler ordered Operation Spring Awakening to secure the extremely vital Nagykanizsa oil fields of southern Hungary which made up 80% of the remaining reserves for the European Axis powers. He stated that he would rather see Berlin fall than lose the Hungarian oil area and Austria because without these resources the war effort could not be continued.
German units involved in Operation Spring Awakening included the 6th Panzer Army with its subordinate Waffen-SS divisions such as the 1st SS Panzer Division Leibstandarte SS Adolf Hitler and the 12th SS Panzer Division Hitlerjugend. Other participating forces were the 2nd SS Panzer Division Das Reich, the 9th SS Panzer Division Hohenstaufen, and the 16th SS Panzer Grenadier Division Reichsführer-SS brought from Italy through the Brenner straight.
On average for every kilometer of Front, 700 or more anti-tank mines and 600 or more anti-infantry mines were placed by Soviet forces preparing for Operation Spring Awakening. In the 26th Army sector these numbers rose to 2,700 and 2,900 respectively while 66 anti-tank zones were created between the 4th Guards Army and 26th Guards Army.
By the 14th of March Operation Spring Awakening was at risk of failure after heavy losses including 15,117 casualties in Heeresgruppe Süd during the first eight days of the offensive. The strategic consequences included the destruction of elite Waffen-SS divisions and the loss of the last significant oil reserves which left Sepp Dietrich's army with only six tanks remaining.