Early morning start is best for this for sure.
Had the pleasure of meeting Mr Ken for the 1st time on this tour, an ex translator for the US Army back in the war with fascinating insight and knowledge; he's still going strong @ 70+
The tour was really interesting and well worth the eary rise, absolutly fascinating what you see and the background around the damage to the area during the war.
Go early as once the tour buses arrive it will be chaos.