Alf Hiltebeitel made a translation of the 1st edition of

Heur et malheur du guerrier. Aspects mythiques de la fonction guerrière chez les Indo-Européens, Paris : Flammarion, 19691,  19852 : The Destiny of the Warrior, Chicago UP, 1970. 

and of the 3rd part of the 1st edition of

The translation of two other parts of the latter have been ed. by J. Puhvel, The Stakes of the Warrior [https://archive.org/details/GeorgesDumezilTheStakesOfTheWarrior], and The Plight of a Sorcerer [https://archive.org/details/GeorgesDumezilJaanPuhvelDavidWeeksThePlightOfASorcererUniversityOfCaliforniaPress1986], Berkeley, UCP, 1983 and 1986. There also exists also English translations of Dumézil's Mitra-Varuna (Paris: Gallimard, 1940/48) by D. Coltman, New York : Zone Books, 1988 [https://archive.org/details/georges-dumezil-mitra-varuna - https://archive.org/details/GeorgesDumezilMitraVarunaAnEssayOnTwoIndoEuropeanRepresentationsOfSovereignty1990 - https://archive.org/details/Mitra-varunaAnEssayOnTwoIndo-europeanRepresentationsOfSovereignty]; Les dieux des Germains (Paris : PUF, 1959) + 4 articles, dir. by E. Haugen, Gods of the Ancient Northmen, Berkeley, UCP, 1973 [https://archive.org/details/GeorgesDumezilGodsOfTheAncientNorthmenUniversityOfCaliforniaPress1973 - https://archive.org/details/bub_gb_DZIeNMgZhRwC];  La religion romaine archaïque (Paris : Payot, 1966) by Philipp Krapp, Archaic Roman Religion, 2 vols, Chicago UP, 1970 [https://archive.org/details/dumezil-archaic-roman-religion-with-an-appendix-on-the-religion-of-the-etruscans-part-1 - https://archive.org/details/dumezil-archaic-roman-religion-with-an-appendix-on-the-religion-of-the-etruscans-part-2 - https://archive.org/details/ArchaicRomanReligion]; Du mythe au roman (Paris : PUF, 1970) by D. Coltman, From Myth to Fiction, Chicago UP, 1970; Mythe et épopée III (Paris : Gallimard, 1973) ed. by U. Strutynski, Camillus, Berkeley, UCP, 1980 [https://archive.org/details/GeorgesDumezilCamillusAStudyOfIndoEuropeanReligionAsRomanHistory1980].

Best wishes,

Christophe Vielle