Re mass combat mini 6 and d6 system have a great technique where you use average result for all dice except the Wild Die, and can assume 1 in 6 wild die rolls get a 6 and reroll. This makes it very easy to do say 60 shots at once vs the hero pc or ship.I'm using Mini Six RPG (free pdf at Mini Six: Bare Bones Edition - AntiPaladin Games | DriveThruRPG.com ) for a cinematic low fantasy swords & sorcery campaign. Not Game of Thrones gritty, but Conan/Kull/Beastmaster sort of level. Mini Six derives from the d6 System used for stuff like 1987's d6 Star Wars from West End Games, and does Hollywood style action very well.
My campaign page, including some rules extracts Primeval Thule