Wildfires intensified across southern Europe on Wednesday after a nightlong battle to protect the perimeter of Greece’s third-largest city, with at least three more deaths reported in Spain, Turkey and Albania. Outside the Greek port city of Patras, firefighters struggled to protect homes and agricultural facilities as flames tore through olive groves. As water-dropping planes and helicopters swooped overhead, residents joined the effort, beating back flames with cut branches or dousing them with buckets of water.