Battle of the Bulge
Allied High Command considered the Ardennes a quiet sector. Allied intelligence services said that the Germans were unable to launch any major attacks this late in the war. The Allies thought that the Germans were getting ready for defence. The Allies thought that a new defensive army was being formed around Düsseldorf in the northern Rhine. The Germans tricked the Allies by increasing the number of flak batteries in the area and making more radio transmissions in the area.