Who married Mary Howe?

General Sir William Augustus Pitt KB PC (c. 1728 – 29 December 1809) was a long-serving if undistinguished senior officer of the British Army whose sixty years of service covered several major wars and numerous postings as garrison or regiment commander. He served as MP between 1754 and 1761. He came from a notable political family: his father was also an MP and his elder brother George Pitt became Baron Rivers.