Repeated event in Delta County, Michigan

Reading another report of a Bigfoot sighting in Delta County, MI 1982 has prompted me to report the following. My family has property in Delta County (near Cornell - UP Mich). One evening during hunting season (November 1982) I was at the camp alone. It was approximately 11:00 at night. We had no electricity and was playing solitaire with a kerosene lamp for light and a wood stove for heat. I was planning on spending night and getting to my hunting blind in the morning. A fairly loud "whack" startled me. Something had hit the window/screen behind me. I turned around and looked at window but I couldn't see anything. I walked to window and peered outside but it was dark and couldn't see anything. I figured it was just "the wind" or something so sat back down. A few minutes later it happened again. Another fairly good "whack" to the window. This startled me even more. I started to think possibly someone was playing a practical joke on me. The camp is approx 30-40 feet from any trees and no branches could be "brushing up against" the cabin. There is an apple orchard near it. Maybe 100 yards away. I shined a strong flashlight outside and couldn't see anything. After a couple of minutes I closed drapes as tight as I could and sat back at table with loaded rifle next to me. A few minutes later I heard a large whack against the window and also multiple whacks and hits, dragging down the side of the camp! This flat out scared me and I grabbed my rifle and yelled as I walked out the door with flashlight in hand. I circled the camp a couple of times calling out. (saying things like "who's out here?!" If you are playing around you need to be careful because I will shoot your *$$!"). Well I was scared. I packed my things and locked up camp and left that night. The gate (about a 1/2 mile or so from camp) was still locked. (you needed a key to get onto property). I don't have any idea what/who did that but a bigfoot sighting 1 month earlier/same year (nearby - within a mile) reported here on this site prompted me to post this report. Maybe relevant (maybe not). Also - I think I will mention this...perhaps it has no relevance to Bigfoot. The same year out in my blind I heard a really strange sound. It sounded kind of like an elephant trumpeting. It was probably about 50 to 60 yards behind my hunting blind. I have never heard of a bigfoot making that kind of sound but that is as close as to the sound I would describe it. It didn't sound exactly like an elephant trumpeting but close. I heard it twice. Once close and then one more time further in the distance. Very weird but - that's what I heard and that's the best way I can describe it. Very loud.