Bertin, Eddy C. "Tijdstorm"
Summary: Barely allohistorical story of a man, caught in a timestorm, who discovers humanoid aliens tinkering with the human past, encouraging the spread of war.
Published: In De achtjaarlijkse god, Bruno & Zoon 1971.
Original in: Dutch.
Translation: English by Eddy Bertin as "Timestorm", in The 1972 Annual World's Best SF (eds. Donald A. Wollheim and Arthur W. Saha), DAW 1972.