The sword and shield soldiers are the easiest: keep circling, shield up, until the second of their three attacks, then attack until you’ve depleted your stamina (or use magic if a mage).
It takes similar strategies to beat each of the three, but you have to be mindful of the different attacks each use. There are three different forms of these green knights one with a sword and shield, one with a broadsword and one with a giant club.
