Before the revolution, the Red Army in China had the following eleven rules, divided into two groups, one of three, the other of eight.
The three preliminary rules:
1. Prompt obedience to orders
2. No confiscations whatever from the poor peasantry
3. Prompt delivery directly to the government (Red soviets), for its disposal, of all goods confiscated from the landlords
The eight key rules, with a focus on dealings with peasants:
1. Replace all doors when you leave a house (!)
2. Return and roll up the straw matting on which you slept
3. Be courteous and polite to the people and help them when you can
4. Return all borrowed articles
5. Replace all damaged article
6. Be honest in all transactions with the peasants
7. Pay for all articles purchased
8. Be sanitary, and, especially, establish latrines a safe distance from people’s houses
Apparently, these eight form a song, sung on the march or while working.
Update: here it is.