Page "Amalek" Paragraph 31

Some commentators, such as Rabbi Hayim Palaggi ( 1788 – 1869 ) argued that Jews had lost the tradition of distinguishing Amalekites from other people, and therefore the commandment of killing them could not practically be applied ("... We can rely on the maxim that in ancient times, Sennacherib confused the lineage of many nations.

" Kol Ḥai, 73, on Sanhedrin 96b )