Battle School is another interesting episode in Dad's Army's evolution. Like the first episode of series 3, it's not an especially funny episode but it is a well-directed one, making good use of more ambitious outdoor locations as the platoon get involved in a training exercise away from the comforts of Walmington-on-Sea. There's a well-established, immersive atmosphere as we follow the characters on their train journeys, through an uncomfortable night in a barn, and then out in the field for the exercise. There's some uninspired physical comedy involving falling in mud and water, which would've been more effective if done once rather than repeatedly, and the scenes of Jones falling on the ground and emerging with various objects stuffed in his mouth are just awful. But the telling of the story works, even if few of the jokes do. The underlying theme of Mainwaring trying to regain his platoon's confidence provides a satisfying throughline and the sense of camaraderie by the end is palpable. There's also an interesting meta moment in which the platoon whistle the theme tune to Dad's Army as they're marching.