The Polish Home Army's War Against Everyone

The Polish Home Army (Armia Krajowa) fought a three-front war: against the Germans, against Soviet partisans who wanted to install a communist government in Poland, and against Ukrainian nationalist forces (UPA) who were massacring Polish civilians in Volhynia. At its peak, AK had over 380,000 members, making it the largest resistance organization in occupied Europe. They maintained their own intelligence service, courts, newspapers, and even universities where education was illegal under Nazi occupation. The AK provided approximately 43% of all intelligence reports received by British intelligence from continental Europe.