Quote Originally Posted by Gelatinous Cube
If I was going to set out to see exactly how horrible war could be, I'd also say Vietnam war. American soldiers who suffered through that have my utmost respect, as no American army before or since has had to deal with such outrageous conditions.
Italy wasn't exactly a cakewalk. The various assaults on Monte Cassino supposedly chalked up a higher casualty rate than Omaha beach in terms of fraction of troops committed, except there were more troops involved, and the battle took several months to resolve.

Battle of Monte Cassino

The central thrust by U.S. 36th Division commenced three hours after sunset on January 20. The lack of time to prepare meant that the approach to the river was still hazardous from uncleared mines and booby traps and the highly technical business of an opposed river crossing lacked the necessary planning and rehearsal. Although a battalion of the 143rd Regiment was able to get across the Rapido on the south side of San Angelo and two companies of the 141st Regiment on the north side, they were isolated for most of the time and at no time was Allied armour able to get across the river leaving them highly vulnerable to counter-attacking tanks and self-propelled guns of General Rodt's 15th Panzer Grenadier Division. The southern group were forced back across the river by mid-morning of January 21. Maj. General Keys, commanding II Corps, pressed Maj. General Fred Walker of 36th Division to renew the attack immediately. Once again the two regiments attacked but with no more success against the well dug-in 15 Panzer Division: 143rd Regiment got the equivalent of two battalions across but once again there was no armoured support and they were devastated when daylight came the next day. 141st Regiment also crossed in two battalion strength and despite the lack of armoured support managed to advance half a mile. However, with the coming of daylight, they too were cut down and by the evening of January 22 the regiment had virtually ceased to exist with 40 men making it back to the Allied lines. The assault had been a costly failure with 36th Division losing 2100[2] men killed, wounded and missing in 48 hours.

And that was just one attempt, out of the many that took place.