Some historians referred this changing to the outbreak of the fourth Ottoman Safavid war, and the destabilization of the Ottoman Empire after the assassination of Sokollu Mehmed Pasha. The Ottoman Empire feared a new war and as a result Murad III sent Al-Mansur a letter in 1580 asking him for alliance to retrieve Andalusia. Murad III also offered, in the letter, Al-Mansur three hundred ships, thousands of elite fighters, and one of his daughters for marriage.