Did Hungary Reduce Illegal Migration by 99% With a Border Wall?

In 2015, Hungary built a fence barrier on its border with Serbia and Croatia protecting the EU border, the Schengen Area. Height: 4 metres (13 ft) Length 523 kilometres (325 miles), Owner: Hungary, Operator: Hungarian Defence Force, Controlled by: Hungary - in cooperation with the Visegrád Four: Czech Republic, Poland, Slovakia