Howarth Family from Wexford Ireland Busch Family from Australia Germany United States

MY great great grandfather hailed from Wexford, Ireland. His name was John Howarth born about 1820 and either emigrated or left Ireland as a soldier, arriving in Sydney around 1840. I am trying to find his exact birth date and place of birth. I know he died in Queensland in 1897.

Also looking for Busch family ex Germany/Victoria, Australia/Western Australia