The show isn't about walkers anymore. It's a drama. I reluctantly caught up and i bet it's going to take like 2 more episodes before any "fighting" begins.
Quite possible, even if they do it exactly like in the graphic novel it's going to be a few episodes before they actually begin any fighting. They're going to have to get the other communities on board and prepared.
Now from the small glimpse of things we saw in the preview I'm thinking they're actually deviating from the source material a bit here. In the comic there are basically 3 fights between Rick's people and The Saviors. A very small skirmish and 2 major battles.
It looked like, unless I'm just seeing it wrong from the previews, that Rick's people might actually be taking the fight to small groups of Saviors first. Small attacks allowing them to dwindle down some of the numbers and to arm themselves as well.
Now the capture of Eugene makes a huge difference in all this, as does Rick and his people having now guns really, as neither of those things happened in the comic.