[2] Joshua attended Caulfield State School and Wesley College, was briefly a motor mechanic, and became a teller at the Bank of Australasia.

Promoted from major to lieutenant colonel in 1942, he commanded the 2/43rd Battalion, which fought around Lae and Finschafen in New Guinea.

[1] Upon returning to civilian life, Joshua began to reshape his previously conservative political views.

Joshua's religious affiliation had been described at school as being "theist", although his background and views were described as "resist[ing] easy classification"; he eventually became an Anglican.

[1] Together with all of the other Anti-Communist members, Joshua was defeated at the 1955 election, having declined an offer from Prime Minister Robert Menzies not to run a Liberal candidate in his seat.

[1] Joshua died of cancer on 2 June 1970 at Ballarat, four days before his 64th birthday, survived by his wife, son and five daughters.