30303020
I am afraid this is not the right place for this kind of data, because it is presumable and historic (see https://wiki.openstreetmap.org/wiki/Good_practice#Don.27t_map_historic_events_and_historic_features). 
There is OpenHistoricalMap (http://www.openhistoricalmap.org/#map=12/53.9148/14.1452&layers=H) for historic data.