1: (7)Soldier (level 40ish Phylis used (5 sortie recovery skill)) - Won't really be taking damage, so it's all about their skills
2: (9)Soldier (Level 43ish Julian used (10 sortie recovery skill)) - Won't really be taking damage, so it's all about their skills
3: (15)Bottom witch (Level 50/36 CC'd Shiho used) - This is a point when sortie is pretty stretched, you may want to place a lower cost witch here instead like Calliope
4: (10)Prince (Level 100 used)
5: (10)Top witch (Level 50/22 CC'd Calliope used)
6: (16)Bottom right healer (50/41 CC'd Alisa used, she's blocked by the A in clear in image)
7: (25)Top right healer (41 Echidna used)
8: (17)At about 9 kills when the Black Axe Knights pass that point and the wolves come, place duelist, CC'd valk recommended for magic resist, high hp and extra sortie from the wolves (50/39 CC'd Carrie used.)
9: (10)Second duelist at the top, you basically just add in anything you can afford. If your soldiers are better than mine so you have more sortie, use something better. Surprisingly a level (46 Mischa) worked with this build.
10: (18)3rd healer in middle (40/35 CC'd Polka used)
Brackets is sortie cost so you can tell if you'd have enough to summon. The only point you probably need to watch is that you have enough to place your first duelist by the time the wolves come, so you may need to use lower cost healers (Than Echidna). I used her just to show even with this build you have some spare sortie to throw around. 137 total sortie used.
I'm kind of surprised this worked honestly lol. I thought I'd need a stronger duelist on top but with the 3 healer set up it worked fine, Mischa's recovery move was great too. I planned on putting Karma or the Dark Elf Fencer there but realized I didn't have the sortie yet. It did get close at times when the enemies started spawning, but activating skills helped. I also had enough sortie to replace somebody if needed by then too.
I also played around with putting Mischa where the Prince is earlier (Then using Prince where Mischa is when Liches come), if your soldiers suck skill wise, you may need to do something like that to get enough sortie. Even though I didn't use it that run, it should work. You can see that the Prince takes almost no damage and it should make killing the top Lich even easier/faster.