CREATE TABLE table_55185 ("Week" TEXT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Kickoff [a ]" TEXT, "Game site" TEXT, "Attendance" TEXT, "Record" TEXT)

Who was the opponent on September 13, 1992?
SELECT "Opponent" FROM table_55185 WHERE "Date" = 'september 13, 1992'
SELECT "Opponent" FROM "table_55185" WHERE "Date" = 'september 13, 1992'