The members of the family who were primarily involved in the case, were Barthold Gerstmann, his wife, and his two sons. Barthold Gerstmann is described as a devout Lutheran, widely respected as a general practitioner. The two sons referred to, are the writer of the diary, Florian Bertram, still a student at the time, and a younger son whose age is not given although he is obviously old enough to give detailed reports and be accepted as a witness by his father and brother. A daughter is also mentioned as the first person to become aware of the incidents. There were however other non-family witnesses: Many of the later occurrences were witnessed by the family maid and amongst the many spectators to the events, is an important witness, the parson Brügmann.

The phenomena primarily concerned stone-throwing, breaking windowpanes and went on for 20 days. In total 760 stones and 147 broken panes were documented. The bombardment started originally outside the house but afterwards continued even inside. Apparently all the stones came from the garden or the wall and were sometimes found to be mingled with clay and nails. On examination, they occasionally felt warm. The father described what was experienced as especially extraordinary about these incidents:

“We were not able to see the stones before they either broke through the window-pane and fell to the ground or landed in the garden, or even when they fell on the pavement in front of the house, but in all cases they could be gathered and identified. They hit nobody and were only thrown to damage something, destroying whatever object they hit” (Gerstmann 1714, p.l09).

Source: https://annekatrinpuhle.de/blog/?page_id=738&lang=English