Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_11793221_4 (complement VARCHAR, unit VARCHAR)
### Question:
Name the number of complement for 4th hanoverian brigade
### Answer:
SELECT COUNT(complement) FROM table_11793221_4 WHERE unit = "4th Hanoverian Brigade"