SELECT "Game site" FROM table_21899 WHERE "Opponent" = 'Dallas Texans'
What was the game site against the Dallas Texans?
CREATE TABLE table_21899 (
    "Week" real,
    "Date" text,
    "Opponent" text,
    "Result" text,
    "Game site" text,
    "Record" text,
    "Attendance" real
)