[1] His first aerial victory came on 2 December 1917, flying with Second Lieutenant Wilfred Beaver, when he destroyed an Albatros D.V south-east of Passendale.
Mathers' next two victories came on 4 February 1918 over the Menen–Roulers road when he and pilot Lieutenant Rex G. Bennett drove down one D.V and sent another down in flames.
On 17 February he and Second Lieutenant Ernest Lindup destroyed a Pfalz D.III over Westroosbeke.
Mathers gained another double victory on 9 March with Second Lieutenant Leslie H. T. Capel, driving down two D.Vs south of Menen.
For his final victory Mather was paired with Wilfred Beaver again, when he sent another D.V down in flames north of Ploegsteert Wood.