inroad vs sally

inroad

noun
  • An advance into enemy territory, an attempted invasion; an encroachment, an incursion. 

  • Often followed by in, into, or on: initial progress made toward accomplishing a goal or solving a problem. 

sally

noun
  • A sortie of troops from a besieged place against an enemy. 

  • A kind of stonefly. 

  • A willow 

  • An excursion or side trip. 

  • An object made from the above trees' wood 

  • A witty statement or quip, usually at the expense of one's interlocutor. 

  • A sudden rushing forth. 

  • Any tree that looks like a willow 

  • A tufted woollen part of a bellrope, used to provide grip when ringing a bell. 

  • A wren. 

  • A member of the Salvation Army. 

verb
  • To set out on an excursion; venture; depart (often followed by "forth.") 

  • To make a sudden attack (e.g. on an enemy from a defended position). 

  • To venture off the beaten path. 

How often have the words inroad and sally occurred in a corpus of books? (source: Google Ngram Viewer )