ɪt wʌz dɪvˈɛləpt baɪ dʒˈɜːməniz kɹˈʌp ˈɑːɹmz wˈɜːks ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd nˈaɪnti θɹˈiː ænd kwˈɪkli ɹᵻplˈeɪst hˈɑːɹvi ˈɑːɹmɚɹ æz ðə pɹˈaɪmɚɹi mˈɛθəd ʌv pɹətˈɛktɪŋ nˈeɪvəl ʃˈɪps, bᵻfˌoːɹ ɪtsˈɛlf bˌiːɪŋ səplˈæntᵻd baɪ ðɪ ɪmpɹˈuːvd kɹˈʌp sᵻmˈɛntᵻd ˈɑːɹmɚ.
It was developed by Germany's Krupp Arms Works in 1893 and quickly replaced Harvey armour as the primary method of protecting naval ships, before itself being supplanted by the improved Krupp cemented armour.