Spots 
Sabotage is not limited to trained commandos blowing up bridges with high explosives. Simple sabotage relies on everyday tools, small acts of negligence, and ordinary citizens executing uncoordinated actions that compound over time. Disrupting an enemy requires no specialized equipment when ordinary malice, carelessness, and clumsiness can produce equal destruction.
The citizen saboteur operates without a formal network or central commander to avoid detection. Safety relies on performing acts that resemble normal human error, equipment failure, or natural wear and tear. If a train delay appears to stem from a misplaced tool or poor maintenance, counter-espionage agents cannot easily distinguish deliberate subversion from incompetence.
Industrial infrastructure depends on smooth mechanical operations and constant lubrication. Introducing sand, Emery dust, or small pebbles into oil reservoirs, fuel tanks, and grease cups rapidly destroys engines and bearings. Targeting critical moving parts causes catastrophic internal grinding while leaving no external trace of immediate tampered damage.
Transportation networks fail when minor friction accumulates across vital transit points. Cutting telephone wires, damaging railway switches, cutting tire valves, and misrouting freight car destinations stall whole logistical chains. Small, targeted physical interruptions create widespread shipping delays, stranding supplies far from the front lines where they are needed most.
Organizational productivity drops fastest when managers and office workers follow every rule to extreme limits. Demanding written orders, insisting on committee approval for minor decisions, filing paperwork improperly, and raising irrelevant issues at length paralyze administration. Bureaucracy itself becomes a weapon when procedural perfection replaces actual output.
A wartime guide detailing how ordinary citizens can paralyze enemy organizations and infrastructure through low-tech disruptiveness.