^ What he said. I also saw this tour (but in Cleveland, obviously), and Motorhead was indeed fucking loud...but Slayer was absolutely INSANE
EDIT: Based on the tour dates on www.slayerized.com
, it would have been November 9, 1988 at the Cleveland Agora for me. To this day, this show still sticks out in my memory as having had one of the biggest, most violent pits I've ever witnessed in my life.