G'day Jason, The McCardle coat of arms is as follows:- Blazon of Arms: Argent, a fess azure,in base a crescent gules, in chief two lions' heads erased of the third. Crest: A demi-lion rampant gules. Motto: Virtute et Valore. Translation : By virtue and Valour.
There is a siter in Ireland where coats of arms can be viewed. I cannot recall the address at this time , will let you know when I recall it.