i could probably tell you, and also why they were destroyed.
in desert storm, it was the thermal imager of the abrams, and poor maintenance by iraqi army. most of the systems in their tanks were barely functional, and they had spent most of their best ammunition fighting the iranian army, which was outdated export rounds design (BM-12, BM-15) unable to penetrate even the front armour of the T-72M1. in 1991, russian army had far better BM-32 and BM-42 in their arsenal, with double the penetration power.
during 73 easting, if i record correctly, the iraqis dug their tanks down into battle positions, so their tanks were completely stationary. a sandstorm blew up however, which obscured the american advance. while the iraqi tanks were completely blinded by the sandstorm, the americans were able to see around 500-1000m ahead with their thermals. the result was a complete destruction of the iraqi ambush.
the difference in training between US and iraqi army also has to be emphasized. Iraqi army barely received any training, much less live fire training. meanwhile the US army had training simulators, and frequent live fire training exercises, along with joint training exercises with NATO.
as a comparison, sweden did a trial years ago with centurions and strv 122, where they put a completely fresh crew into the strv 122 and centurion crew with years of experience. the result was predictable.
strv 122 crew was completely outclassed by the much more experienced centurion crews.