CREATE TABLE table_46841 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

What was the tie no when Watford was the away team?
SELECT "Tie no" FROM table_46841 WHERE "Away team" = 'watford'
SELECT "Tie no" FROM "table_46841" WHERE "Away team" = 'watford'