 The Polish Chevau-léger regiment distinguished itself at the Battle of Somosierra in 1808 In the early 20th century a number of Polish volunteers participated in the Spanish Civil War on the Republican side and were primarily assigned to the Dabrowski Battalion.Poland and Spain re-established diplomatic relations on 30 May 1919, in the aftermath of World War I.During World War II, Spain remained neutral and did not participate in the war directly.