A couple of feeders were put out for a week prior but none were taken at the feeder as much as in the area, may have helped but not directly.Were the squirrels taken at a feeder with your .22LR or just roaming about ?
The site is a brook valley with beech and birch and mixed ground cover, it was interesting watching them stationary until sunrise then moving around ground for food for the 3H after then going back to rest until repeating at sunset, they are definitely best to be chased during daylight hours as they go back up tree otherwise.