11 And it came to pass in the thirteenth year there began to be wars and contentions throughout all the land; for the ^aGadianton robbers had become so ^bnumerous, and did slay so many of the people, and did lay waste so many cities, and did spread so much death and carnage throughout the land, that it became expedient that all the people, both the Nephites and the Lamanites, should take up arms against them.