What is the fine-grained topic of the following text: William Henry Reeves, a farmer from Belfast, Christchurch, attested for the 5th N. Contingent and was embarked in the S. 14 Company, he served in Rhodesia, in addition to other operations and was invalided home in February 1901. Only return the topic.
William Henry Reeves' military service in the 5th N. Contingent