The USAF report also states that two of Dresden's traffic routes were of military importance: north-south from Germany to Czechoslovakia, and east–west along the central European uplands. The city was at the junction of the Berlin-Prague-Vienna railway line, as well as the Munich-Breslau, and Hamburg-Leipzig lines. Colonel Harold E. Cook, a US POW held in the Friedrichstadt marshaling yard the night before the attacks, later said that "I saw with my own eyes that Dresden was an armed camp: thousands of German troops, tanks and artillery and miles of freight cars loaded with supplies supporting and transporting German logistics towards the east to meet the Russians".