Sentence:  By setting rules specifying whom <WSD>arms-bearers</WSD> were not allowed to attack, the kinds of property they were not allowed to touch, and days of the week and seasons of the year when they were not allowed to use arms, the peace council regulations also gave the Church the authority to determine who could employ arms, for what purpose, on whose command, against whom, and when. 
Meaning of the word marked with <WSD> tags:  An armed fighter, such as a soldier or knight; one who carries and uses a weapon, as opposed to a member of the support personnel.