Murad III's offer of an alliance with the Sa'dids to recover al-Andalus

Al-Salabi says that when Spain annexed the Portuguese lands in 988 AH (1580 CE), Sultan Murad III proposed a military alliance with the Sa'di state against the Spanish, by supplying it with a fleet and troops. ²

Murad sent two letters in Rajab 988 AH (September 1580 CE). Al-Salabi says that news of the king of Castile and his seizure of the sultanate of Portugal had reached the sultan and stirred his Islamic zeal. He called for a treaty between the two kingdoms to be hung on the Ka'ba. He offered, if this were done, to send three hundred imperial galleys and an Ottoman army to conquer the lands of al-Andalus. ²

The data does not give the Sa'dis' reply, which needs an additional source.