Mallow March is the first stage in Sweetest Sorrow.
Peons spawn at a slow rate, releases Martin once base is damaged.
This stage would be partially a pain for those who haven't got Bahamut cat from EoC Chapter 3 so get it sooner. Unless you want to grind with an early Uber or Valkyrie, which can be a pain for the user still. For high-progress players, just fire away at this stage its an easy 70k EXP. Not that its really significant for them...