He was then struck with a debilitating sickness .
In July 1781 , he allowed both his sons to depart , Adams to serve as translator for Francis Dana during his mission to Russia , and Charles to go home .
Adams was then struck with a debilitating sickness .
In July 1781 , he allowed both his sons to depart , Adams to serve as translator for Francis Dana during his mission to Russia , and Charles to go home .