The Percy-Neville feud just pre-wotr is pretty interesting, and came to blows several times. In 1453, at Heworth Moor, younger sons of Lord Percy, along with hundreds of retainers/supporters, attacked a Neville wedding party. Further raids and counter-raids took place in the following months. Another larger conflict at Stamford bridge in 1454 ended this phase of the families feuding, and Egremont was captured and imprisoned.
There's also another feud that occured in Yorkshire in the 1440s, between the Archbishop Kemp and the Percy family. The Archbishop ended up recruiting border reivers/ruffians to police the city of Ripon and enforce tolls at markets/fairs. Locals from Knaresborough, who should have been exempt from such tolls, were not too happy and ambushed the reivers at Thornton Bridge.
I found this PhD by Mark Punshon very useful for details on the above.
https://etheses.whiterose.ac.uk/2454/1/DX223236.pdf