Surely the days at Antietam and Iwo Jima and Hill 881 North provide some comparison.
I guess if your in your own small fire slugfest it seems like the most intense one in the world to yourself. My son was in the 505 in Iraq in ‘03 and he was ambushed during a night time operation. He called me the next day on a satellite phone and I could tell that he was in an intense firefight. A couple of years later he told me the details and other stories that if I had known about them at the time I would have been doubly worried. Being a parent of a kid in combat in WW II,Vietnam,Korea takes its own courage. Especially during Vietnam and Iraq because of the comments you’d get from idiots that were anti-war. Even in your own family. You really have to maintain control when someone makes a snide remark when your son is in combat.
In the Civil War battle of Cold Harbor, the Grant ordered his troops into a frontal assault against strong Confederate defenses that resulted in about 5,000 Yankees killed in about 30 minutes.