According to the Internet, "War on Earth" was published in Spain, 1945, by Editorial Marco [https://www.tebeosfera.com/numeros/guerra_a_la_tierra_1945_marco_1.html]. Or 1946 and 1947, according to another part of the Internet (see next link).
Written by Marijac (pseudonym of Jacques Dumas) [https://www.lambiek.net/artists/m/marijac.htm] and drawn by Auguste Liquoise [https://www.lambiek.net/artists/l/liquos_auguste.htm] (Part 1) and Pierre Duteurtre (Part 2) [https://www.lambiek.net/artists/d/dut.htm]. Parts 3-7 artist(s) unknown, but there is a signature in the lower right hand corner of Part 5, Page 8 (which I cannot make out).
It seems as if these were reprinted as a collection by Cómic-MAM [https://www.comicsdecoleccion.com/comics-por-editoriales/771--guerra-a-la-tierra-reedicion.html], possibly in 1990 (War on the Earth Collection facsimile) [https://www.ebay.com/itm/304171602564?hash=item46d20a5284:g:2agAAOSwLZZhWcsw]. These may be from that reprint.
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