The invasions of the other Axis Powers such as Japan and Italy get overshadowed. Soviet Russia invaded Manchuria on the same day Nagasaki was bombed, but without it, Japan might’ve been able to hold out longer. The Battle of the Bulge is overshadowed but it has 80,000 American deaths and 100,000 German deaths, and it was the final step in finishing off Germany since it exhausted all of its resources on the battle sending the army into disarray allowing the Soviets to capture Berlin. Those are just two of the many overshadowed important battles in World War 2.
A battle is not just just important, because of the amount of casualties taken or the reason that a state would have surrendered earlier.
Let us take a look at your example of the Battle of the Bulge. Would the outcome of the war be very different, if the battle had gone differently? Probably not. Maybe the USSR would have captured more of German core territory than in our timeline, but the basic outcome of the war would not have been different.
If you look at the Battle of Stalingrad or the Battle of Kursk for example, which are very famous battles on the Eastern front. These battles could have gone either way and probably leed to an other outcome of the war.