At 3:00 a.m. on 4 November, Soviet tanks penetrated Budapest along the Pest side of the Danube in two thrusts—one from the south, and one from the north—thus splitting the city in half. Armored units crossed into Buda, and at 4:25 a.m. fired the first shots at the army barracks on Budaõrsi road. Soon after, Soviet artillery and tank fire was heard in all districts of Budapest. Operation Whirlwind combined air strikes, artillery, and the coordinated tank-infantry action of 17 divisions. By 8:00 am organised defence of the city evaporated after the radio station was seized, and many defenders fell back to fortified positions. Hungarian civilians bore the brunt of the fighting, and it was often impossible for Soviet troops to differentiate military from civilian targets. For this reason, Soviet tanks often crept along main roads firing indiscriminately into buildings. Hungarian resistance was strongest in the industrial areas of Budapest, which were heavily targeted by Soviet artillery and air strikes. The last pocket of resistance called for ceasefire on 10 November. Over 2,500 Hungarians and 722 Soviet troops had been killed and thousands more were wounded.