CREATE TABLE table_49370 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

What is Tie No, when Away Team is 'Millwall'?
SELECT "Tie no" FROM table_49370 WHERE "Away team" = 'millwall'
SELECT "Tie no" FROM "table_49370" WHERE "Away team" = 'millwall'