Hello kilian
This plane is not a Nieuport 10 but a Nieuport 12
You can recognize because of transparent covering on upper wing
The engine was a 110 hp clerget 9 Z-It was a two-seater observer plane with a Lewis machine gun fore the observer/gunner
Some times an other was mounted to the too of upper wing(dont think that is the case here,)-It is a French unit (roundels with sky blue in middle)
The nieuport 12bis was same as N12 butwas fitted with a 130 hp clerget and was recognizable because of its circular cowling
Cordialement
Bruno