Answer: They refused to bear arms in war.
Step-by-step explanation:
The Society of Friends, also known as Quakers, consider that war is against God's commands, so they are pacifist that advocate for non-violence.
They declared their commitment to peace in 1660, and have opposed all wars since then refusing to bear arms during conflicts.
However, Protestantism view of them as blasphemous and as a threat to social and political order led to their persecution in England and Wales under the Quaker Act 1662 and the Conventicle Act 1664.