plugin execution & phase/goal selection question

I have a POM with packaging set to 'war'.
I want to run 'antrun' plugin just before the code is compiled. What do I
set the plugin's phase and goal to?

My understanding is that the phase is one of the war's phases, for example:
'process-resources'
Or a default one, for example: 'initialize'

How about the goal, is that one of the antrun's goals?

Your help is appreciated!