Over the next 90 minutes, Field Punishment No.1 shuttles backwards and forwards between Archie recuperating in hospital and the events that led him there. It's an effective structure, nicely handled by editor Paul Maxwell, that creates a mystery the viewer wants to see solved - not that it remains mysterious for too long what has reduced Archie to his catatonic state.
"No doubt we're a hindrance to you, but we act out of deeply held convictions," Archie tells an officer. "We don't expect any special treatment. We just ask that you treat us as men and not as soldiers. That's all."
Of course that's all too much for the military commanders. Armies operate on unthinking obedience because if soldiers stopped and thought about war's whys and wherefores, they'd almost always refuse to fight, especially in the face of the utterly senseless slaughter of trench warfare. So Archie and his comrades are treated as less than men to provide an object lesson to the troops about the price paid for not following orders.
Their trials and tribulations - their torture, there's no other word for it - get progressively worse and include the penalty that gives the programme its name: being tied to a post in a stress position in freezing conditions all day for 28 days in a row at Mud Farm Detention Camp in France, an injustice James K. Baxter immortalised in his poem, Pig Island Letters.
At times it's hard to watch the brutality the men are subjected to but director Peter Burger and cinematographer David Paul often find a stark beauty in the subject as well. Designer Miro Harre and costume designer Kirsty Cameron create an amazingly authentic sense of period and scale, and Victoria Kelly's restrained but emotive score adds to the mounting air of horror and melancholy. The cast are uniformly excellent.
I can't command you to watch this programme but I strongly urge you to. It's your patriotic duty.
Field Punishment No.1 screens Tuesday, 8.30pm, on TV One.