CREATE TABLE table_43835 ("Date" TEXT, "Opponent" TEXT, "Site" TEXT, "Result" TEXT, "Attendance" TEXT)

Who was the opponent when they played at the legion field birmingham, al site?
SELECT "Opponent" FROM table_43835 WHERE "Site" = 'legion field • birmingham, al'
SELECT "Opponent" FROM "table_43835" WHERE "Site" = 'legion field • birmingham, al'