I agree with Hal. The fact that no target is mentioned in the briefing scene implies that the Resistance simply doesn’t know what the target is going to be. But since they or the Republic are the only logical choice, they would rush to prevent it anyway.

However, I think that it would help the narrative if it is shown that the Resistance is actually trying to warn the Republic and hopes to get their help. That would be possible by inserting the deleted scene in a similar fashion to what NeverarGreat proposed and possibly by using a suggestion I made before that has someone asking if the Republic will send help during the briefing scene. If the proper audio could be found, we could use the cut shot of Leia right before 3PO’s line about the Republic fleet to have her answer that question with “No.” or “No, they won’t.” Then we’d only need to get a shot where we could have someone ask “Will the Republic send help?”. I’d place the added lines right before Poe says: “We’ll go in there…”