If you hear rumblings from northern Lebanon County this weekend, worry not—it’s probably just the Gap.

Fort Indiantown Gap will once again be conducting training activities this month. Artillery training began yesterday, October 3, and will continue through Sunday, October 6.

An additional artillery training will be held again October 27 to October 30, and mortars training will be conducted October 26. All trainings will occur between 8am and 11pm.

Fort Indiantown Gap is the only live-fire, maneuver military facility in Pennsylvania.

Here’s video from last year’s exercises.