Another example is farmers in Belarus during WWII. Often the whole villages together with tools and machinery if it was any were burned down due to heavy fighti

Another example is farmers in Belarus during WWII. Often the whole villages together with tools and machinery if it was any were burned down due to heavy fighting. People survived by living in dugouts and planting potato’s by hands. Potato in especially suitable in such situations. It brings more calories per area than even rice while one still can harvest it using basic sticks. While it cannot be stored for years after the harvest as wheat, it still can last for couple of years.