Has Muhammad really waged many wars?

I find a deep discrepancy between the Holy Quran and the later histories of Muhammad ﷺ: In the Quran, we find the words of guidance that our last Prophet received during the battle against the polytheists in Mecca in Sura At-Tawba, but there is no indication of any other war that he may have fought after that; the Suras that are said to have been revealed after that do not give any indication of any war activity. In contrast, Islamic traditions mention many (25 to 29, see here ) battles, suggesting that he never stopped waging wars after this. None of these battles seem to have been recorded outside Islam. I suspect that the hadiths reporting Muhammad's exuberant war activities were invented by later Islamic leaders who successfully conquered many regions to justify their actions. Are there any authors who support my suspicion, based on the Qur'an, that Muhammad was much less belligerent and much more inclined to peace than the traditions suggest?