West Ferris Secondary School is the venue Saturday night for a presentation on trench warfare during World War One. Noted historian Andy Robertshaw will explain what soldiers faced while fighting in the trenches. Robertshaw is a frequent guest on TV history programs hosted by the History Channel and BBC. He was also a military consultant for director Steven Spielberg for the 2011 film “War Horse”. His free presentation is in the auditorium of the high school and begins at 7:00pm.