I'm currently working on a new Modern AGE campaign. It will be set in 1898 and take place in France. I want to use D&D's U1-2 & 3 as the story arc. U1 is very easy to adapt to that era. But U2 and U3 have Lizarmen and Sahuagins as protagonists. I don't want to use fantasy creatures in this campaign. How would you transform them, and the plot, to make them work in the «real world» of 1898?