With the army of occupation came 800 wounded soldiers from the other theatres of operations. Most of them were immediately turned over to the American Red Cross unit established in Belgrade, already caring for 1,200 wounded Serbians. As the fighting continued in the interior these numbers were constantly augmented, until the American hospital sheltered nearly 3,000 wounded men. When the evacuation began the Austrians left their own wounded, but took with them the Serbian patients, to swell the number of their prisoners of war. Several hundred of the non-combatant citizens were also taken into captivity. In the importance of its influence on the war as a whole, the achievement of the Serbians in repelling the three Austrian invasions will probably be found, when the later history of the war is finally written, to take very high rank. For had Serbia fallen, the Teutonic Empires would have been united with little delay to their Turkish allies. Austria might then have been able to hold off the Russians by herself, while the Germans would thereby have been so much stronger for pressing their campaigns in Belgium and East Prussia; with what results can only be guessed. The Austrians themselves were astounded by the extraordinary power of little Serbia. Their last disaster, indeed, so roused their anger that they began preparing again for another attempt to conquer this stubborn little nation. Calling the Germans to their aid, they began in January, 1915, to collect a new army, 400,000 strong, which was ranged along the Serbian frontier. But the pressure from the Russians on the Carpathian front presently became so heavy that this body of troops was needed there, and so Serbia was left in peace for the time being. Thenceforward only insignificant fighting took place between the belligerents on each side of the river, such fighting being mostly in the nature of artillery actions. Belgrade was not again, during that period at least, subjected to bombardment. An arrangement was made between the Serbian and Austrian commanders whereby the Serbians refrained from firing on Semlin, and the Austrians spared Belgrade.