If your grandfather served in 2 Fd Regt RCA then he was not at D Day and the majority of his war was spent in Italy.
2 Fd Regt RCA was one of the the Field Artillery Regiments that supported 1 Canadian Infantry Division throughout the war. So you can safely say that wherever 1 Canadian Infantry Division went then so did 2 Fd Regt RCA.
In Italy, from my perspective as a battlefield guide, they had three big encounters – Ortona in Dec 43, Cassino in May 44 and the Gothic Line at Rimini in Sep 44.
In Jan 45, the two Divisions of I (Cdn) Corps – 1 Canadian Infantry Division and 5 Canadian Armoured Division, were moved from Italy to North West Europe to reinforce the Canadian Army there.