number of temporary workshops. The most spectacular single
product of FAMO was the Eisenbahnpanzerzug Poersel, an
armoured train mounting 88-mm, 37-mm and 20-mm anti-air-
craft guns, and two MG-42 machine-guns. This fearsome as-
semblage was first taken into action by First Lieutenant Poersel
on 20 March, and it went on to destroy seven tanks and three
aircraft. Its presence was very comforting to the defenders, and
particularly those in the area of Gandau airfield.
On 1 February the quantity of ammunition in Breslau was
calculated at 130,000 rounds, which was alarmingly low. A
search of the stores revealed forty 125-mm heavy mortars, for
which it was easy to manufacture the 'low technology' am-
munition. Elsewhere the Germans came across about 100,000
empty shell cases for light field artillery. The necessary fuzes
were flown in from the Reich, and the filling was extracted from
unexploded Russian bombs—a delicate process, since the ex-
plosive became fluid only at 90 degrees Centigrade, but ex-
ploded at 102 degrees. Some of the duds contained notes from
the German prisoners of war who had been forced to manu-
facture them: 'This is all we can do for you, comrades!' With
this the Germans had reached the end of their technical re-
sources, and the shortage of ammunition threatened to cripple
the defence, to the extent that the artillery was forbidden to
open fire without the permission of the commandant.
From the time the Russians had cut off Breslau on 15 Feb-
ruary, the survival of the city hung to a great extent on air
supply. On the next night the aircraft began their ferry service
to Breslau, flying in artillery ammunition and other precious
commodities, and leaving when possible with loads of
wounded men. The classic Ju-52 trimotor was a strong and
reliable machine, capable of carrying twenty-eight passengers
or their equivalent in cargo at time, but the Germans had too
few planes of this kind to meet the demands of Breslau, and
the aircraft could not be risked in daylight against the batteries
of anti-aircraft guns which the Russians massed along the ap-
proaches. Gandau field was too short for the fast tactical aircraft