Even though it may be tempting to bring anti-red units to deal with the Capies, don't. They are very short-ranged, and one bad hit can kill them in one attack. Just Use this strategy. Lineup: Mohawk, Eraser, Crazed Macho, Crazed Wall, Crazed Dragon, King Dragon, Paris, Ururun, Crazed Bahamut, and Catdam.
Start off by stalling the Le'boin until you have max money. Then use Dragons and Parises to kill it. Keep on spawning long-Rangers, but not Bahamut, Ururun, or Catdam.
When the base is hit, Capy spawns. This is when you should summon Bahamut, Ururun, and Catdam. Eventually, Nyandam will spawn. He doesn't do a ton of damage (~15000) so he's not a big threat. Soon, a 1,600,000/37,000 J.K. Bun Bun will spawn. There should be three Capies supporting him. If you have enough Dragons, they should deal tons of damage to Bun Bun, and Catdam can keep the enemies slowed. Once J.K. dies, the battle becomes much easier. Just get rid of the Capies and kill Nyandam.