Blyth entertained league leaders Barnard Castle who arrived full of confidence and with an unbeaten record, and fresh from a 100-point win the previous week.
From the kick-off Castle attacked the Blyth line but the home side fought back and took the lead with a penalty.
Blyth’s pack was disrupted by an injury to prop Kyle Norris and had influential full-back O’Neil struggling with an ankle injury.
The visitors exploited this to cut through holes in the Blyth defence for two tries.
Full of confidence they started opting for scrums instead of kicking penalties and were rewarded with a further two tries.
As the game drew to a close the visiting backs ran in a further two tries before Blyth’s young winger Sanderson scored a consolation try as it finished 38-11 to the visitors.
Although Blyth started the game missing four regular first team members and suffered three more injuries, they were well beaten by the better side on the day and who look certain to win the league this season.
Next week’s game is away to local rivals Rockcliffe, kick-off 2.15pm.