John Brown's group of soldiers included
Many Southern sympathizers
U Harriet Beecher Stowe
Stephen Douglas
Members of his own family (his sons)
Frederick Douglass

Members of his own family (his sons)

John Brown took 5 of his sons to attack Pottawatomie Creek, hacking five proslavery men to death. The Army was there, and ended up killing all of his sons and capturing Brown.

Use the formula: (n-2)×180, where n is the number of sides(18-2)×180= 28800, now this is the full exterior angle of 18-gon so you divide it by 18.28800÷18=160