Short answers, pulled from the story.
The main objective of Operation Northwind 1944 was to destroy and exterminate enemy forces wherever they were found. The attack aimed to break through lines held by the U.S. Seventh Army and the French First Army to seize Strasbourg.
Operation Northwind 1944 began on the 31st of December 1944 when German Army Group G launched a major offensive. The operation ended on the 25th of January 1945 after the U.S. 222nd Infantry Regiment stopped their advance near Haguenau.
Generaloberst Johannes Blaskowitz commanded German Army Group G alongside Reichsführer-SS Heinrich Himmler who led Army Group Upper Rhine. Colonel Hans von Luck led the 125th Regiment of the 21st Panzer Division within this force.
The operation took place in the Rhineland-Palatinate, Alsace and Lorraine regions of France and Germany. Fighting occurred specifically around the Maginot Line south of Wissembourg and villages like Rittershoffen and Hatten.
Operation Northwind 1944 failed because Eisenhower sent troops north to reinforce American armies in the Ardennes leaving the 7th Army in dire straits. Supplies and ammunition were short by the 21st of January which forced a tactical withdrawal from key positions.