Answer:
You have not provided options for your question and I have not found any online, but we will clarify this sentence.
These words come from a letter from Lieutenant Roberto Estevez to his father, before going to war.
What he means by the words “estare rindiendo mis acciones a dios nuestro señor." is that by the time the father is reading the letter that Roberto left him, he will probably be dead, because he went to do his duty.
He is convinced that he has to fulfill his mission and that God wants it that way.