Like preventing the Hezbollah attack on Israel for example. And yes, an Irish soldier died. Pte Rooney.

I hope the other missions went better ...

Btw: Lebanon convicted someone to a death sentence over this killing. He wasn't in court however and the conviction remains without any actual consequence for the killer, he hasn't ever been arrested. The Irish government had no reaction, other than hiding that this happened, and that nobody was actually punished is not well known in Ireland.