VUKOVAR, Croatia (Reuters) - Thousands of Croats, including war veterans in wheelchairs, filed in a silent column through the streets of Vukovar on Friday to mark 20 years of its capture by Serb rebels and the first mass atrocity of the war in the former Yugoslavia. "I've brought my entire family here so they can pay respects to the victims and see how Croatia was created," said Ante Marojevic, a war veteran from the southern town of Metkovic, holding his son Luka by the hand. On Nov 18, 1991, Serb militia and Yugoslav army troops who refused to accept Croatia's independence captured the once prosperous, ethnically mixed town on the banks of the Danube.