It was the German Condor Legion (Luftwaffe) which bombed Guernica. The Nazis were there to help Franco against the Commies. Franco knew they were going to bomb Guernica which was in the hands of the Commies at the time - but it was the Germans who carried it out. It was not bad at all by WWII standards. It was just shocking to everybody because it was the first time an air force really bombed a city.
**The Nazis were there to help Franco against the Commies.**
Thanks bud.