What did Clinton mean by "a dear bought victory, another such would have ruined us"

Answer 1

British General Clinton had just led the British to victory at Bunker Hill. However, they had very high casualties.

http://www.ncs-nj.org/teachers/svain/americanrevolution/Bunker%20Hill.htm

Answer 2

Mrs. Sue, you wrong, the British lost! You big dumb.