Following the resignation of his colleague , Robertson , who lost the confidence of the Assembly , Cowper became Premier on the fifth and final occasion in 1870 .
Cowper retained government on the fourth occasion by defeating Martin at the 1864 -- 65 general election .
Following the resignation of Cowper 's colleague , Robertson , who lost the confidence of the Assembly , Cowper became Premier on the fifth and final occasion in 1870 .
Cowper retained government on the fourth occasion by defeating Martin at the 1864 -- 65 general election .