I had been invalided home from the Front; and, after spending some months in a rather depressing Convalescent Home, was given a month's sick leave. 
I did not return home at any time.  
mnli hypothesis: I did not return home at any time.   premise: I had been invalided home from the Front; and, after spending some months in a rather depressing Convalescent Home, was given a month's sick leave. 