The tactic the Germans employed to achieve surprise in the Battle of the Bulge was a concentrated frontal assault.

The German forces aimed to exploit a perceived weakness in the Allied lines by launching a surprise offensive through the dense Ardennes Forest. This region was believed to be lightly defended, allowing the Germans to concentrate their troops for a massive frontal assault. The attack began on December 16, 1944, catching the Allies off guard and initially leading to significant territorial gains for the Germans. The combination of poor weather conditions, which hampered Allied air support, and the element of surprise allowed the Germans to penetrate deep into Allied territory before the latter could mount a coordinated response. However, as the battle progressed, the Allies regrouped and ultimately pushed back the German offensive.