This is the civilian population (and their activities) of a country at war.
The Second World War was the most widespread and deadliest war in history, Involving more than 30 countries and having more than 50 million military and civilian deaths. Sparked by Adolf Hitler’s invasion of Poland in 1939 and as well on Feb. 23, 1942 a Japanese submarine shelled an oil facility near Santa Barbara, just 80 miles up the coast form Los Angeles. The war from then on would go on for six deadly years until the final allied defeat of both Nazi Germany and Japan in 1945.