I don't believe so. Sappers are also the only piece able to destroy mines correct?

I am confused about one area of this game. It says in the rules that a sapper if attacking a general the sapper wins, and if the general attacks the general wins, well I attacked a 5 with a sapper and my sapper was removed from the board. Isn't this an error? What does beat a 5 other than another 5?

I get the 4's and 5's confused. Which are generals? 5's right?