Valkyria Chronicles: Battle at Marberry Shore
I didn't expect to get a first time "A" rank here. There was lots going on, and it wasn't until a couple moves in that I understood the map enough to figure out the winning strategy, and even then it took a couple moves to execute it.
The strat was pretty simple, in the end. With Isara's smoke bombs providing cover, Alicia, powered up with Welkin's orders, just, nigh-invulnerable, ran to the end camp, killed the two defenders, and took the flag.
I lost the NEXT battle outright. Stupid snipers and anti-tank weapons. I'll have to think about it some more.