Delete "Fish in a Barrel." It is only challenging because it has no winning strategy.

Big horde of walkers? Don't rush in. Use ranged.
But most of them are armored. Use melee.
But don't use melee, there are too many close together.
Maybe you can retreat and use overwatch, and let them come to you a couple at a time? No, you start out backed into a corner, and the whole map is one small, empty rectangle.
Your only option is to micro-move as well as you can and hope the randomly generated spawns are favorable.
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Comments
- Charged warriors? Use Beta & 2 other warriors with Dragon's Tongue and chainsaws to kill almost everyone right away and herd the rest.
- Charged Assaults / Bruisers: stun everyone
- Charged hunters: Use Festive Shotgun & Shanes buckshot to kill / stun everyone.
Or use RGG to get charges.
At top levels when quick killing is not an option you still have to revert to Sasha but before that many alternatives exist.
I am no Stelio,
But Fish In Barrel Mission,
is one very easy fruition
https://forums.nextgames.com/walkingdead/discussion/40263/wild-walking-is-actively-seeking-new-members#latest