No. 30 Company's 1877-79 South Africa Medal Roll confirms Clarke's entitlement to the medal with the clasp "1879".

Clarke was already a member of the Royal Engineers in 1871 when the
1871 Worldwide British Army Index shows him as No. 9265
Sapper Josiah Clarke with 22 Company, Royal Engineers at St. John's Wood, London. He would transfer to 30 Company, R.E. on 1 June
of that same year.

As of 18 September, 1880 Corporal Josiah Clarke was still with 30 Company at Gibraltar when that unit's South Africa Medal Roll was
compiled. If Clarke remained with 30 Company after the war he would has seen no further service in the field since that unit remained in
garrison duties until well into the 20th Century when the unit was overrun by the Japanese at Singapore in February, 1942.

To date no additional information regarding Clarke's life after service has come to light.