I think apaches were used in Iraq war to destroy mobile radars (not sams...).as most of the control centers, air bases etc were already taken down by F-117.
You are right. During the First Gulf War of 1991, Before, Allies launch first wave of aerial attack, on 17 January 1991, 6-8 Appaches, were sent at night of 16 January. to take out a radar system at some border outpost, to punch a hole in the radar coverage. Once this radr system was taken out, Then real cavalery was called. The point to bhe noted that it was a classical SEAD mission, where instead of fighters, helicopters were used, which flew nap of earth, in the cover of darkness.
Appache is one othe most combat proven aircarft, besides AH-1F Cobra and MI-24/35 Hinds. Appache has seen much action in Gulf, Bosnia and Israel, then any other gunship.
Anybody interested, then watch movie
Fire Birds, based on Appaches, starring Nicholas Cage and Tommy Lee Jones.