What happened in the forty days in the wilderness?

Mark tells it in two verses: "Immediately the Spirit drove him out into the wilderness. He was there in the wilderness forty days, tempted by Satan. He was with the wild animals; and the angels were serving him" (1:12-13) (tap serving). He doesn't say what the temptations were or how they ended. Matthew and Luke tell more. Matthew says, "When he had fasted forty days and forty nights, he was hungry afterward" (Matthew 4:2), and then, "The tempter came and said to him" (Matthew 4:3), and gives what was said on both sides (Matthew 4:3-10). Luke says, "He ate nothing in those days" (Luke 4:2), and tells it too (Luke 4:1-13). Those are their accounts. Mark's is the short one, and these notes don't fill it in from theirs.