 Complete the following phrase:  A Nationalist stronghold at the start of the Spanish Civil War, Mallorca was subjected to an amphibious landing, on 16 August 1936, aimed at driving the Nationalists from Mallorca and reclaiming the island for the Republic. Although the Republicans heavily outnumbered their opponents and managed to push inland, superior Nationalist air power, provided mainly by Fascist Italy as part of the Italian occupation of Majorca, forced the Republicans to retreat and to leave the island completely by 12 September. Those events became known as the 