Rotterdam

The German ultimatum ordering the Dutch commander of Rotterdam to cease fire was delivered to him at 10:30 a.m. on May 14, 1940. At 1:22 p.m., German bombers set the whole inner city of Rotterdam ablaze, killing 30,000 of its inhabitants. (OWI)
NARA FILE #: 208-PR-10L-3
WAR & CONFLICT BOOK #: 1334