So, Rick sent Jesus to follow Dwight back to The Saviours community (which we still haven't seen the results of).
Eugene is a smart enough guy to know how to build bullets with the right supplies, well why don't they use the black powder which go in bullets and put them into pipe bombs.
Once Jesus reports back with where they hold up, they drop off some supplies at their community with some type of explosives in the boxes, pipe bomb, plastic explosive. I'm sure Eugene would know how to make some high explosives.
Just an idea on how to solve The saviour problem. Or they can just hop in cars and run away..