The disastrous 1789 smallpox epidemic was estimated to have killed about 53% of Sydney's indigenous population, and it was claimed that only three Cadigal people were left alive sometime in 1791, although archaeological evidence suggests that some Cadigal people may have escaped to the Concord area and settled there.
Epidemi besar cacar 1789 diperkirakan telah memusnahkan sekitar 50% populasi penduduk asli Sydney, dan telah diklaim bahwa hanya 3 orang Cadigal yang masih hidup pada 1791, meskipun bukti arkeologi menyatakan bahwa sejumlah penduduk Cadigal melarikan diri ke daerah Concord dan menetap di sana.