They fought in the fields has always been one of my favourite episodes of Foyle's War, so many great elements combine to make this an excellent piece of drama. Firstly, the story, very complex and diverse, without being confusing. Kitchen is at his very best, his scenes with James Wilby were fantastic, and there is finally a spark in Foyle's eye as he glances several times at Stella Gonet. There are the German prisoners, I think it's the first time we see a group of prisoners detained, and the sub story there is brilliant, talk about multi layered. Sam's war effort is questioned, the character proves her worth physically and intellectually, it's one of her best episodes. Finally, of course there are some incredible production values, it looks impressive. Very little to fault, one of the best.