Okay, first the proofs:
https://www.rt.com/news/492047-twenty-indian-soldiers-killed-china/
This Hungarian article says they attacked each other with stones and sticks:
https://index.hu/kulfold/2020/06/16/kina_india_himalaja_hatarvita_kasmir_verekedes_osszetuzes_villongas_viszaly_amerika_modi_hszi/
This link I found in the article above:
https://www.hindustantimes.com/india-news/army-confirms-india-china-face-off-minor-injuries-to-both-sides/story-8VJk43aU1O7Vw0jWtV9ARP.html