In March 1855 , when Lord Palmerston became prime minister .
The Peelites withdrew from the cabinet , Horsman was made Chief Secretary for Ireland , and was sworn a member of both the British and Irish Privy Councils .
In March 1855 , when Lord Palmerston became prime minister and the Peelites withdrew from the cabinet , Horsman was made Chief Secretary for Ireland , and was sworn a member of both the British and Irish Privy Councils .