7. Why did earls and barons want to be fined only by their peers?

'Earls and barons are not to be fined except by their peers, and only in accordance with the nature of the offence'.

Clause 22: Nullus clericus amercietur de laico tenemento suo, nisi secundum modum aliorum praedictorum, et non secundum quantitatem beneficii sui ecclesiastici.

'No clergyman is to be fined on his lay tenement, except in accordance with the nature of his offence, in the way of others mentioned in previously, and not in accordance with the size of his ecclesiastical benefice'.

Ibelieve the answer is  battle of saratoga but i could be wrong