After extensive Mediterranean service and an exchange deployment with HMAS Australia, Sussex returned to the region during the Spanish Civil War. Supported by the destroyers Intrepid and Impulsive, she protected neutral shipping off Spain's eastern coast. The cruiser obtained the release of at least four British cargo ships seized by Nationalist forces in open waters, although she could not prevent the merchant raider Mar Negro from capturing Stangate near Valencia. Cruiser presence could enforce maritime neutrality and protect commerce without a formal war between Britain and Spain.
Chapter · 50:23-51:59
Sussex protected neutral shipping during the Spanish Civil War
On patrol off eastern Spain, Sussex challenged Nationalist interference with neutral trade and secured the release of at least four British cargo ships.