The Sixth Siege of Gibraltar in 1411 was the only occasion on which control of Gibraltar was contested between two Islamic powers. After the failed Fifth Siege of Gibraltar in 1349–50, which ended with the death of King Alfonso XI of Castile from bubonic plague, the Kingdom of Castile was preoccupied with the Castilian Civil War and its aftermath. In 1369, Sultan Muhammed V of Granada took advantage of the Castilians' distractions and in the Siege of Algeciras (1369) he seized the city of Algeciras, on the west side of the Bay of Gibraltar, which Alfonso XI had captured in 1344. After razing it to the ground he made peace with Henry II, the winner of the civil war. The truce was renewed by Henry's successors John I and Henry III. At some point during the truces, control of Gibraltar was tr