For this map in particular, there aren't many enemies, and the go to strat is to move/warp someone with high defence, like Lukas, onto the bridge to choke it. I do believe said bridges, like floor tiles in gaiden, give 20 avoid, but I could be wrong. Then just keep squishy units like silk away from the front or on one of the few trees.
With the improved UI and Speed of the remake, this map may take 4-5 min tops on a first playthrough, and maybe even faster without animations.