The Lambton Shores Predators hung tough with one of the top teams in Ontario on Saturday in Forest before eventually bowing 3-1 to Stratford.
The Cullitons are now 20-2 on the season, while the Preds fall to 10-15.
Lambton Shores had beaten Owen Sound, 6-2 on Friday.
The Preds travels to St. Marys on Friday, before hosting LaSalle on Sunday night in Forest at 8 pm.
Meantime, Sarnia, coming off a 9-3 win in Listowel on Friday, have a home-and-home series with London this week.
The teams will play in London on Wednesday before returning to the Sarnia Arena on Thursday.
The Nationals leads the Western Conference by a point over Sarnia and St. Thomas and two points on Leamington, but the Legionnaires have several games in hand on all their rivals.