Yeah, but as you saw.... that plan didn't go so well as they slunk away and escaped back to their respective ratholes. This... means....war. Unleash the dogs (and tiger) and let the real hell begin.
Rick and the Alexandrians placed way too much trust in the Garbage Pail kids...knew next to nothing about them, assumed that they would be against the Saviors, gave them dozens of weapons and then turned their backs on them when they were ready for the showdown...STUPID, STUPID, STUPID. Otherwise, the plan might have worked to some extent. They wouldn't have had the truck bomb sabotaged, wouldn't have been stopped from engaging Negan and crew. Dwight was obviously unaware of the plan because he did what he said he'd do, slow them down by dropping trees.
The ominous signs and comments from Garbage Pail kids were all over the place before Negan showed up...I would have placed their people in positions where my people could watch them and prevent them getting the drop on all of my people simultaneously.
Serious lack of situational awareness and leadership on Rick's part. He got a lot of people killed and injured because he didn't seriously consider the consequences of letting dozens of strangers into the compound.