How do you survive chapter 19 Last Hope with only Eirika as a level 6 ..

Well you can have Seth fight his way down to the lower-left part of the map (at this point, you will be just outside the castle) and take out Riev. If you do this, you will not have to survive 13 rounds. Keep everyone else in the throne room, with Colm and Joshua in front to take out anyone who tries to come in. Keep Saleh and Innes behind them to pick off straglers. If you don't start with everyone in the throne room, then go to "Check Map." Next go to "Formation" and you will be able to change where your units start out. You must move fast because in a matter of about 5-7 turns, you will be flanked by Heros, Snipers, Archers, Knights, and Warriors who will be coming from the upper right part of the map. Riev has 49 HP, and his "Aura" will do some serious damage, so you might wanna pack some "Pure Water." Also, you can, once you clear the way, use Saleh with his Anima spells, because they have an advantage over Riev's Light spells. Good Luck.

Ha.. Thats pretty sad... Okay... Train your people alot more and get Ephraim and/or Eirika to level 20.If you have Ross or Ewan or Amilia train them like this.
Ross: Journeyman: Train him to level 10 than he will automatically change class into a pirate or a fighter, train him as a pirate untill level 20 than use an ocean seal make him a warrior, train him to atleast level 10.

Ewan:Pupil: Same thing at level 10 he changes class turn him into a shaman, train him to level 20 than change class to a summoner train him to level 20

Amelia: Same thing, change class into a knight train her to level 20, than change class into a great knight train her to level 10 or higher. Trust me this works.

P.S.: Train your other people way more all level 15 or higher. Hope I helped

What you'll want to do is go back to the tower of valni and train them until you have a good lvl lord or two. I went throgh it with pretty crappy characters myself.

You couldn't survive wit that group?OMG.i survived with only a lvl 10 summoner knoll a lvl 8 hero gerik a lvl 5 rogue colm a lvl 5 general ameila(by the way shes an uber general with over 20 in all stats including speed) and a lv 19 cleric natasha. my advice to those of you who can't win at this lvl with good chars is give up.(and yes I killed riev every time I played this lv(oh and he drops aura,all the more reason to kill him after you got all the treasure)

Offense strategy:my advice is that you need to first get all the treasure(thifs will coem in and steal it)afterward send everyone you have(and if someone has a purge bolting or eclipse spell use it on riev itll take soem tiem but it's works wonders)and send them towards the bottom left and dotn back down unless one of your characters is abotu to die.use anything and everything you have to kill riev.also have at least two high level units gaurding the top area(heros snipers archer warriors and alot of others will come through to kill mansel)the two staircases may seem like enemies will coem through but theyre just for show.also I advise to have two others with good defense and atk(speed doesnt matter)at the bottom right as in the last few turns 4 generals and 4 warriors will come in through the area near the chests.also try to kill the enemy untis with the brave items(brave sword lance axe bow etc.)as those are very rare and very awesome items.(i killed a lvl 10 draco zombie in one turn with a lvl 10 hero gerik usign a brave sword and no criticals(he went nuts and did 4 hits))defense strategy:soem points in my offense strategy like the gaurd top area and bottom right area are crucial if youre a defensive person.if youre defending and want the treasure try offense till you get either colm or rennac to the treasure on the left.the right area is pretty much safe except for the two axe fighters and the druid.(if you stand on the pillars the druid shouldnt be able bother you much because his low hit).if you have all treasure chests(and trust me theres soem good items like a runesword and a bolting in them)then head back as fast as you can to the throne room.if mansel is injured then rescue him and move onto the throen with the unit carrying him or heal him and kill the enemy that hurt him and seal that exit off or risk another enemy coming in and killing him(the top right area of the throen room is safe for awhile after you kill the axefighters and the druid).other than that the defense strategy is almost the same as the offense one.also if you want even better defense and you take risks,try fighting the enemys at the bottom left area till you can get two mages(doesnt matter what type)and two high defense,resistance,and attack fighters to gaurd that area where the area is only two spaces long so they can block any access.I'd also advise you brign a healer incase one is low on hp.

Well, I'm a bit late, but what I did was if you don't care about aura, I used very speedy charecters to block the lower left corner where all the high enemies come in. No weapons lets weak swordmasters block the rest of the group.

Start over. Get a better team. Don't suck so hard this time.