Source: During research on maps for St. Eloi Craters Battle found web site outlining detailed biography of this soldier.
Enlisted with the 18th Battalion. Released due to health. Re-enlisted under reg. no. 602664.

Pvt. J.H. Nicholls. The absence of cap and collar badges suggests this is a 1914 photo (the army didn’t have enough of anything to go around), most likely when he was with the 18th Battalion. Source: http://bit.ly/2Uivv98