user: Question: How many Attendances on 13 April 1903?
Columns: ['Date', 'Opponents', 'H / A', 'Result F – A', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['6 September 1902', 'Gainsborough Trinity', 'A', '1 – 0', 4000.0]
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Date" = '13 April 1903';