I'm glad you found the chart,
@Lady Chessa. It was a bit difficult because, in my case, I wasn't sure at first what you meant by battles. It could be tournament, or encounters to open up new provinces. I took it, at first, to be encounters to complete neighbor scouting. But. it appears, you were asking for the chart saying what a player in the first five chapters should be expected to do in the tournament. And that's what the chart you finally got, tells you. However.....
As noted by
@Lady Dastardly, that chart is based on the old tech tree. Not sure the new one would change things much, but it might. More to the point is: much of what
can you do in the first five chapters....well, actually in the whole game.... depends on what you are doing, how you are doing it, and your purpose in doing it. In the end, following the chart, even as a "suggested level" may not be appropriate if your goals are different than the "average" person. Still, it's nice to have a sort of "in the ball park" measure.
AJ