Start at Trapper's spot and remember this fight gets messy fast. You'll want something with decent range since that deer hits like a truck when it charges, aiming for the head is your only real option here. Moving sideways helps dodge those charges and staying near walls keeps the small stuff from surrounding you. Just know those rats and dogs will keep coming so deal with them quick, shotgun works great for that or short bursts from your rifle.

Maybe stick close to Trapper since he helps thin out enemies, but don't block his shots. Really important to take out any boars fast, they'll mess up your day if you let them get close. If things get overwhelming back off a bit, clear the small stuff, then focus back on the deer. Mid-range combat works best since you need space to dodge but still gotta land those headshots through all the chaos. Getting too far makes it hard to damage through the armor, getting too close is asking for trouble with those charges.