Mezue nkebi ahịrịokwu a: N'agbanyeghị nke ahụ, n'afọ ndị sochirinụ, e ji ngwá agha ndị na-akpata ọrịa mee ihe n'ọtụtụ agha, bụ́ ndị a lụrụ karịsịa n'ebe ndị mba ọzọ na-achị, bụ́ ndị otu n'ime ha ji ngwá agha karịa ibe ya. Ndị Britain jiri gas na-egbu egbu, ikekwe adamsite, megide ndị agha Russia na-agbanwe agbanwe na-amalite na 27 August 1919 ma tụlee iji ngwa agha kemịkal megide ndị nnupụisi Iraq na 1920s; Ndị agha Bolshevik jiri gas na-egbu egbu iji gbochie ndị nnupụisi ahụ.
Ọgba aghara Tambov na 1920, Spain jiri ngwa agha kemịkal na Morocco megide ndị agbụrụ Rif n'afọ ndị 1920 na Italytali jiri gas mustard na Libya na 1930 na ọzọ n'oge mwakpo ya na Ethiopia na 1936. N'afọ 1925, otu onye agha China, bụ́ Zhang Zuolin, nyere otu ụlọ ọrụ Germany ọrụ iwu otu ụlọ ọrụ na-emepụta gas a na-akpọ mustard gas na Shenyang, bụ́ nke e wuchara n'afọ 1927.