The main close range weapon in the Neolithic age was the wooden club, probably the first human weapon. The spear involved a bit more engineering, and came later. The club could be a big chunk of wood, picked up off the ground.
Archaeologists interested in head injuries exhibited in skulls of over 5,500 years ago, have investigated, using synthetic skulls typically used in wound ballistic tests of firearms, the likely types of injuries:
https://www.cambridge.org/core/journals/antiquity/article/understanding-blunt-force-trauma-and-violence-in-neolithic-europe-the-first-experiments-using-a-skinskullbrain-model-and-the-thames-beater/021170E064757BBF7BF3E1870044A60B/core-reader