The longest choka poem ever written is Utsubo KUBOTA's "Horyo no Shi" (A Song for Dead Captive); Kubota wrote this famous choka after the end of the Pacific War as a lament for his second son who died while detained in Siberia.
太平洋戦争の終戦後に、窪田空穂がシベリアに抑留された次男の死を悼んで詠んだ、長歌史上最長の長歌「捕虜の死」は名高い。