 This attack prompted the building of the walls that surround the property and the building of guard towers, which gives the property a fortress-like appearance.The next attempt on Trotsky's life, on 20 August 1940, was successful.A Spanish Stalin supporter by the name of Ramón Mercader, under the name of Jacson Mornard and with a Canadian passport, had become the lover of Trotsky's personal secretary.