Let Caesar attack the dam again, and we will kick his ass again. That is their thinking. Many here think General Oliver is a moron. He is far from it. Caesar is a moron. Attacking the same stong point, not once, but twice. You don't attack the Enemy where they are. You attack them where they aren't.
We must give Eddie his due....his battle plan against the NCR in the Mojave is actually quite sound. He threatens the Dam with a large force on the other side of the Colorado. While Oliver is fixated on that, he sends in the Frumentarii to destroy the NCR base in Searchlight. With Searchlight out, he is able to occupy Cottonwood Cove, and push through troops and open a new front at Nelson, as well as raid through the South of the Mojave all the way to Novac. Meanwhile, he enlists the Khans as proxy fighters. They flood the area with chems as well as cause trouble for the NCR. I suspect the Khans were also tasked with handling the Fiends, keeping them in chems and on the rampage through the North of Vegas. He also recruits the Omertas to rise up when given the signal. He also takes the opportunity to eliminate groups that would never serve him and could make a difference if they chose to help the NCR....Mr House and the BoS. When all the pieces are in place, the NCR stands alone...beset on all sides by the Khans, Fiends and the Legion, it's supply lines in disarray, and Legion units roaming at will South of Novac and Forlorn Hope. When the time is right, Eddie simultaneously hits Camp Golf and Forlorn Hope, the Fiends attack McCarran, and the Omertas take down the Chairmen and NCR inside the Strip. The NCR forces at the Dam are cut off from supplies and reinforcements...and now have no line of retreat. Then...and only then...does Eddie deploy Lanius and his forces, who have been waiting for weeks for the signal. They attack the Dam both frontally and from below, using route that had been scouted long before. Once pushed from the Dam, Oliver's remaining men have to run the gauntlet of Khans, Legion, and Fiends back to Mojave Station....few of them will likely make it. In a matter of hours the entire NCR Mojave Expeditionary Force is annihilated. Then while the fingerpointing begins back in Shady Sands, Eddie secures the Mojave and digs in...digesting his new conquest and preparing for the campaign that will make him a Legend, the Invasion of California.