III. Principal Highways
The roads of Greece and Yugoslavia were poor, with the exception of a few international highways and limited areas in and about the capitals and major cities. Of the various road nets, the best were those in northwestern Yugoslavia, in the areas taken from the Austro-Hungarian Empire; about Belgrade; through Skoplje to Salonika; in the industrial area about Salonika; and in the Athens-Piraeus industrial and shipping complex.
To the German and Italian occupation forces, the most important road nets were those roughly paralleling the rail lines through northern Yugoslavia, including Belgrade; along the Vardar River to Salonika, thence along the Aegean coast to Athens; a system of roads through the northern half of the Peloponnesus; a series of secondary roads along the Adriatic coast of Yugoslavia; some tortuous roads through the Dinaric Alps; and a few main roads in western Greece. Though some of these roads were paved, the majority were built of crushed stone and unable to support sustained traffic and heavy trucks in any number without constant repair. In many places, lengths of paved road alternated with stretches of crushed stone.
IV. Waterways, Airfields, and Signal Facilities
While the Danube played a significant part in the logistical support of the attack forces, the waterways within Greece and Yugoslavia proper played little part in the later supply of the occupation troops. Perhaps that put to the most extensive use was the Corinth Canal, linking the Gulf of Corinth and the Aegean. By using this canal, the Italians were able to cut the distance from their supply bases along the Adriatic and Ionian Seas to Piraeus and Athens by some 130 miles, avoiding the open sea and British aircraft based in Egypt.
Airfield facilities in Greece and Yugoslavia, though not extensive, were more than adequate for the needs of the Germans and Italians. Stocks of gasoline and other supplies left behind in Greece by the British were put to use, and the slight damage to fighter bases was not enough to prevent their immediate utilization. Perhaps most important strategically were the excellent bases on Crete and in the Athens-Piraeus area.
Signal facilities in the various Balkan countries at the time of the occupation were incapable of supporting heavy traffic. Too, it was a simple matter for the guerrillas to disrupt the few long-distance cables and overhead wires that existed. The mountainous nature of the terrain circumscribed the use of radio, but it was on this and field telephone lines, plus liaison aircraft, that the occupation forces usually had to rely.
