FE fates conquest Lunatic. Last Battle.

I haven't been able to beat the final map in Conquest Lunatic without using staves. It's my first playthrough (maybe I should have started on Normal or Hard). I had to restart from a save four chapters before the end because I didn't have a Rescue staff, since I had already used it to beat another chapter, and even then I still couldn't beat it without using staves like Rescue. For me, this is by far the hardest FE of them all, solely because of this map.

None of my characters have Vantage either. I didn't know it was possible to get it. I also didn't have a Silence staff (at any point, even if I went back and replayed earlier chapters).

I didn't use any Rescue staves in the rest of the chapters so that I could save them for the final map. And even then, I still lost units. I came up with my own strategy for beating the final map by making myself strong in the middle of the map and then sending Corrin in to attack...

I don't know if it's possible to beat it without Rescue without the knowledge you gain from a first playthrough.

P.S. There should never, ever be a double map when the second one is that insanely difficult.