user: Question: Who did the Browns play on October 13, 1968?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 15, 1968', 'at New Orleans Saints', 'W 24–10', 74215.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Date" = 'October 13, 1968';