It was, in a phrase, a race for the ages, an international classic in an American spring classic. The Irish invaded Tennessee in force on Saturday with two world-class competitors, but they could not get past a dead-game Rawnaq (Ire), who led for most of the $200,000 Calvin Houghland Iroquois (Gr. 1), the signature race of the 75th annual Iroquois Steeplechase in Nashville.